diff --git a/docs/api/orders.yaml b/docs/api/orders.yaml
new file mode 100644
index 0000000..861b561
--- /dev/null
+++ b/docs/api/orders.yaml
@@ -0,0 +1,396 @@
+openapi: 3.0.0
+info:
+  title: 订单管理API
+  description: 订单管理相关接口文档
+  version: 1.0.0
+
+paths:
+  /api/orders/:
+    get:
+      summary: 获取订单列表
+      description: 获取系统中的订单列表，支持分页
+      parameters:
+        - name: skip
+          in: query
+          description: 跳过的记录数
+          required: false
+          schema:
+            type: integer
+            default: 0
+        - name: limit
+          in: query
+          description: 返回的记录数
+          required: false
+          schema:
+            type: integer
+            default: 100
+      responses:
+        '200':
+          description: 成功返回订单列表
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: '#/components/schemas/Order'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+    post:
+      summary: 创建订单
+      description: 创建一个新的订单
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/OrderCreate'
+      responses:
+        '200':
+          description: 成功创建订单
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Order'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '422':
+          description: 请求参数验证失败
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+
+  /api/orders/{order_id}:
+    get:
+      summary: 获取订单详情
+      description: 根据订单ID获取订单详细信息
+      parameters:
+        - name: order_id
+          in: path
+          description: 订单ID
+          required: true
+          schema:
+            type: integer
+      responses:
+        '200':
+          description: 成功返回订单信息
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Order'
+        '404':
+          description: 订单未找到
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+    put:
+      summary: 更新订单信息
+      description: 根据订单ID更新订单信息
+      parameters:
+        - name: order_id
+          in: path
+          description: 订单ID
+          required: true
+          schema:
+            type: integer
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/OrderUpdate'
+      responses:
+        '200':
+          description: 成功更新订单信息
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Order'
+        '404':
+          description: 订单未找到
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '422':
+          description: 请求参数验证失败
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+    delete:
+      summary: 删除订单
+      description: 根据订单ID删除订单
+      parameters:
+        - name: order_id
+          in: path
+          description: 订单ID
+          required: true
+          schema:
+            type: integer
+      responses:
+        '200':
+          description: 成功删除订单
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Order'
+        '404':
+          description: 订单未找到
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+
+components:
+  schemas:
+    Order:
+      type: object
+      properties:
+        id:
+          type: integer
+          description: 订单ID
+        order_no:
+          type: string
+          description: 订单号
+        buyer_id:
+          type: integer
+          description: 买家ID
+        seller_id:
+          type: integer
+          description: 卖家ID
+        variety_type:
+          type: string
+          description: 品种类型
+        weight_range:
+          type: string
+          description: 重量范围
+        weight_actual:
+          type: number
+          format: float
+          description: 实际重量
+        price_per_unit:
+          type: number
+          format: float
+          description: 单价
+        total_price:
+          type: number
+          format: float
+          description: 总价
+        advance_payment:
+          type: number
+          format: float
+          description: 预付款
+        final_payment:
+          type: number
+          format: float
+          description: 尾款
+        status:
+          type: string
+          enum: [pending, confirmed, processing, shipped, delivered, cancelled, completed]
+          description: 订单状态
+        delivery_address:
+          type: string
+          description: 收货地址
+        delivery_time:
+          type: string
+          format: date-time
+          description: 交付时间
+        remark:
+          type: string
+          description: 备注
+        created_at:
+          type: string
+          format: date-time
+          description: 创建时间
+        updated_at:
+          type: string
+          format: date-time
+          description: 更新时间
+      required:
+        - id
+        - order_no
+        - buyer_id
+        - seller_id
+        - variety_type
+        - weight_range
+        - price_per_unit
+        - total_price
+        - advance_payment
+        - final_payment
+        - status
+        - created_at
+        - updated_at
+
+    OrderCreate:
+      type: object
+      properties:
+        buyer_id:
+          type: integer
+          description: 买家ID
+        seller_id:
+          type: integer
+          description: 卖家ID
+        variety_type:
+          type: string
+          description: 品种类型
+        weight_range:
+          type: string
+          description: 重量范围
+        weight_actual:
+          type: number
+          format: float
+          description: 实际重量
+        price_per_unit:
+          type: number
+          format: float
+          description: 单价
+        total_price:
+          type: number
+          format: float
+          description: 总价
+        advance_payment:
+          type: number
+          format: float
+          description: 预付款
+        final_payment:
+          type: number
+          format: float
+          description: 尾款
+        status:
+          type: string
+          enum: [pending, confirmed, processing, shipped, delivered, cancelled, completed]
+          description: 订单状态
+        delivery_address:
+          type: string
+          description: 收货地址
+        delivery_time:
+          type: string
+          format: date-time
+          description: 交付时间
+        remark:
+          type: string
+          description: 备注
+      required:
+        - buyer_id
+        - seller_id
+        - variety_type
+        - weight_range
+        - price_per_unit
+        - total_price
+
+    OrderUpdate:
+      type: object
+      properties:
+        buyer_id:
+          type: integer
+          description: 买家ID
+        seller_id:
+          type: integer
+          description: 卖家ID
+        variety_type:
+          type: string
+          description: 品种类型
+        weight_range:
+          type: string
+          description: 重量范围
+        weight_actual:
+          type: number
+          format: float
+          description: 实际重量
+        price_per_unit:
+          type: number
+          format: float
+          description: 单价
+        total_price:
+          type: number
+          format: float
+          description: 总价
+        advance_payment:
+          type: number
+          format: float
+          description: 预付款
+        final_payment:
+          type: number
+          format: float
+          description: 尾款
+        status:
+          type: string
+          enum: [pending, confirmed, processing, shipped, delivered, cancelled, completed]
+          description: 订单状态
+        delivery_address:
+          type: string
+          description: 收货地址
+        delivery_time:
+          type: string
+          format: date-time
+          description: 交付时间
+        remark:
+          type: string
+          description: 备注
+
+    Error:
+      type: object
+      properties:
+        detail:
+          type: string
+          description: 错误信息
+      required:
+        - detail
\ No newline at end of file
diff --git a/docs/api/payments.yaml b/docs/api/payments.yaml
new file mode 100644
index 0000000..7a78fb1
--- /dev/null
+++ b/docs/api/payments.yaml
@@ -0,0 +1,329 @@
+openapi: 3.0.0
+info:
+  title: 支付管理API
+  description: 支付管理相关接口文档
+  version: 1.0.0
+
+paths:
+  /api/payments/:
+    get:
+      summary: 获取支付列表
+      description: 获取系统中的支付列表，支持分页
+      parameters:
+        - name: skip
+          in: query
+          description: 跳过的记录数
+          required: false
+          schema:
+            type: integer
+            default: 0
+        - name: limit
+          in: query
+          description: 返回的记录数
+          required: false
+          schema:
+            type: integer
+            default: 100
+      responses:
+        '200':
+          description: 成功返回支付列表
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: '#/components/schemas/Payment'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+    post:
+      summary: 创建支付
+      description: 创建一个新的支付记录
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/PaymentCreate'
+      responses:
+        '200':
+          description: 成功创建支付
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Payment'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '422':
+          description: 请求参数验证失败
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+
+  /api/payments/{payment_id}:
+    get:
+      summary: 获取支付详情
+      description: 根据支付ID获取支付详细信息
+      parameters:
+        - name: payment_id
+          in: path
+          description: 支付ID
+          required: true
+          schema:
+            type: integer
+      responses:
+        '200':
+          description: 成功返回支付信息
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Payment'
+        '404':
+          description: 支付未找到
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+    put:
+      summary: 更新支付信息
+      description: 根据支付ID更新支付信息
+      parameters:
+        - name: payment_id
+          in: path
+          description: 支付ID
+          required: true
+          schema:
+            type: integer
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/PaymentUpdate'
+      responses:
+        '200':
+          description: 成功更新支付信息
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Payment'
+        '404':
+          description: 支付未找到
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '422':
+          description: 请求参数验证失败
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+    delete:
+      summary: 删除支付
+      description: 根据支付ID删除支付
+      parameters:
+        - name: payment_id
+          in: path
+          description: 支付ID
+          required: true
+          schema:
+            type: integer
+      responses:
+        '200':
+          description: 成功删除支付
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Payment'
+        '404':
+          description: 支付未找到
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+
+components:
+  schemas:
+    Payment:
+      type: object
+      properties:
+        id:
+          type: integer
+          description: 支付ID
+        payment_no:
+          type: string
+          description: 支付编号
+        order_id:
+          type: integer
+          description: 订单ID
+        user_id:
+          type: integer
+          description: 用户ID
+        amount:
+          type: number
+          format: float
+          description: 支付金额
+        payment_type:
+          type: string
+          enum: [advance, final]
+          description: 支付类型
+        payment_method:
+          type: string
+          enum: [wechat, alipay, bank]
+          description: 支付方式
+        status:
+          type: string
+          enum: [pending, success, failed, refunded]
+          description: 支付状态
+        transaction_id:
+          type: string
+          description: 交易ID
+        created_at:
+          type: string
+          format: date-time
+          description: 创建时间
+        updated_at:
+          type: string
+          format: date-time
+          description: 更新时间
+      required:
+        - id
+        - payment_no
+        - order_id
+        - user_id
+        - amount
+        - payment_type
+        - payment_method
+        - status
+        - created_at
+        - updated_at
+
+    PaymentCreate:
+      type: object
+      properties:
+        order_id:
+          type: integer
+          description: 订单ID
+        user_id:
+          type: integer
+          description: 用户ID
+        amount:
+          type: number
+          format: float
+          description: 支付金额
+        payment_type:
+          type: string
+          enum: [advance, final]
+          description: 支付类型
+        payment_method:
+          type: string
+          enum: [wechat, alipay, bank]
+          description: 支付方式
+        status:
+          type: string
+          enum: [pending, success, failed, refunded]
+          description: 支付状态
+        transaction_id:
+          type: string
+          description: 交易ID
+      required:
+        - order_id
+        - user_id
+        - amount
+        - payment_type
+        - payment_method
+
+    PaymentUpdate:
+      type: object
+      properties:
+        order_id:
+          type: integer
+          description: 订单ID
+        user_id:
+          type: integer
+          description: 用户ID
+        amount:
+          type: number
+          format: float
+          description: 支付金额
+        payment_type:
+          type: string
+          enum: [advance, final]
+          description: 支付类型
+        payment_method:
+          type: string
+          enum: [wechat, alipay, bank]
+          description: 支付方式
+        status:
+          type: string
+          enum: [pending, success, failed, refunded]
+          description: 支付状态
+        transaction_id:
+          type: string
+          description: 交易ID
+
+    Error:
+      type: object
+      properties:
+        detail:
+          type: string
+          description: 错误信息
+      required:
+        - detail
\ No newline at end of file
diff --git a/docs/api/users.yaml b/docs/api/users.yaml
new file mode 100644
index 0000000..14c5cf3
--- /dev/null
+++ b/docs/api/users.yaml
@@ -0,0 +1,229 @@
+openapi: 3.0.0
+info:
+  title: 用户管理API
+  description: 用户管理相关接口文档
+  version: 1.0.0
+
+paths:
+  /api/users/:
+    get:
+      summary: 获取用户列表
+      description: 获取系统中的用户列表，支持分页
+      parameters:
+        - name: skip
+          in: query
+          description: 跳过的记录数
+          required: false
+          schema:
+            type: integer
+            default: 0
+        - name: limit
+          in: query
+          description: 返回的记录数
+          required: false
+          schema:
+            type: integer
+            default: 100
+      responses:
+        '200':
+          description: 成功返回用户列表
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: '#/components/schemas/User'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+
+  /api/users/{user_id}:
+    get:
+      summary: 获取用户详情
+      description: 根据用户ID获取用户详细信息
+      parameters:
+        - name: user_id
+          in: path
+          description: 用户ID
+          required: true
+          schema:
+            type: integer
+      responses:
+        '200':
+          description: 成功返回用户信息
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/User'
+        '404':
+          description: 用户未找到
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+    put:
+      summary: 更新用户信息
+      description: 根据用户ID更新用户信息
+      parameters:
+        - name: user_id
+          in: path
+          description: 用户ID
+          required: true
+          schema:
+            type: integer
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/UserUpdate'
+      responses:
+        '200':
+          description: 成功更新用户信息
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/User'
+        '404':
+          description: 用户未找到
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '422':
+          description: 请求参数验证失败
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+    delete:
+      summary: 删除用户
+      description: 根据用户ID删除用户
+      parameters:
+        - name: user_id
+          in: path
+          description: 用户ID
+          required: true
+          schema:
+            type: integer
+      responses:
+        '200':
+          description: 成功删除用户
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/User'
+        '404':
+          description: 用户未找到
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+
+components:
+  schemas:
+    User:
+      type: object
+      properties:
+        id:
+          type: integer
+          description: 用户ID
+        uuid:
+          type: string
+          description: 用户UUID
+        username:
+          type: string
+          description: 用户名
+        user_type:
+          type: string
+          enum: [client, supplier, driver, staff, admin]
+          description: 用户类型
+        status:
+          type: string
+          enum: [active, inactive, locked]
+          description: 用户状态
+        created_at:
+          type: string
+          format: date-time
+          description: 创建时间
+        updated_at:
+          type: string
+          format: date-time
+          description: 更新时间
+      required:
+        - id
+        - uuid
+        - username
+        - user_type
+        - status
+        - created_at
+        - updated_at
+
+    UserUpdate:
+      type: object
+      properties:
+        username:
+          type: string
+          description: 用户名
+        user_type:
+          type: string
+          enum: [client, supplier, driver, staff, admin]
+          description: 用户类型
+        status:
+          type: string
+          enum: [active, inactive, locked]
+          description: 用户状态
+
+    Error:
+      type: object
+      properties:
+        detail:
+          type: string
+          description: 错误信息
+      required:
+        - detail
\ No newline at end of file
diff --git a/fastapi-backend/.env b/fastapi-backend/.env
new file mode 100644
index 0000000..f4b9f40
--- /dev/null
+++ b/fastapi-backend/.env
@@ -0,0 +1,15 @@
+# Database configuration
+DB_HOST=localhost
+DB_PORT=3306
+DB_USER=root
+DB_PASSWORD=your_mysql_password
+DB_NAME=niumall_dev
+
+# JWT configuration
+JWT_SECRET=niumall-jwt-secret
+JWT_ALGORITHM=HS256
+JWT_EXPIRATION_MINUTES=1440
+
+# Server configuration
+SERVER_HOST=0.0.0.0
+SERVER_PORT=8000
\ No newline at end of file
diff --git a/fastapi-backend/.env.example b/fastapi-backend/.env.example
new file mode 100644
index 0000000..efa3259
--- /dev/null
+++ b/fastapi-backend/.env.example
@@ -0,0 +1,15 @@
+# Database configuration
+DB_HOST=localhost
+DB_PORT=3306
+DB_USER=root
+DB_PASSWORD=password
+DB_NAME=niumall_dev
+
+# JWT configuration
+JWT_SECRET=niumall-jwt-secret
+JWT_ALGORITHM=HS256
+JWT_EXPIRATION_MINUTES=1440
+
+# Server configuration
+SERVER_HOST=0.0.0.0
+SERVER_PORT=8000
\ No newline at end of file
diff --git a/fastapi-backend/README.md b/fastapi-backend/README.md
new file mode 100644
index 0000000..ece2e21
--- /dev/null
+++ b/fastapi-backend/README.md
@@ -0,0 +1,42 @@
+# FastAPI Backend for 活牛采购智能数字化系统
+
+This is a FastAPI implementation of the backend for the 活牛采购智能数字化系统.
+
+## Features
+- User authentication with JWT
+- Order management
+- Payment processing
+- Role-based access control
+- Database integration with SQLAlchemy
+- API documentation with Swagger UI and ReDoc
+
+## Requirements
+- Python 3.8+
+- FastAPI
+- SQLAlchemy
+- PyJWT
+- Uvicorn
+
+## Installation
+1. Create a virtual environment:
+   ```bash
+   python -m venv venv
+   source venv/bin/activate  # On Windows: venv\Scripts\activate
+   ```
+
+2. Install dependencies:
+   ```bash
+   pip install -r requirements.txt
+   ```
+
+3. Configure environment variables (see .env.example)
+
+4. Run the application:
+   ```bash
+   uvicorn app.main:app --reload
+   ```
+
+## API Documentation
+Once the server is running, you can access:
+- Swagger UI: http://localhost:8000/docs
+- ReDoc: http://localhost:8000/redoc
\ No newline at end of file
diff --git a/fastapi-backend/app/__init__.py b/fastapi-backend/app/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/fastapi-backend/app/api/__init__.py b/fastapi-backend/app/api/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/fastapi-backend/app/api/auth.py b/fastapi-backend/app/api/auth.py
new file mode 100644
index 0000000..af097e4
--- /dev/null
+++ b/fastapi-backend/app/api/auth.py
@@ -0,0 +1,80 @@
+from fastapi import APIRouter, Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordRequestForm, OAuth2PasswordBearer
+from sqlalchemy.orm import Session
+from app.db.database import get_db
+from app.models.user import User
+from app.schemas.user import UserCreate, Token, User
+from app.core.security import verify_password, create_access_token, decode_access_token
+from datetime import timedelta
+from app.core.config import settings
+import uuid
+
+router = APIRouter()
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="api/auth/login")
+
+@router.post("/login", response_model=Token)
+def login(form_data: OAuth2PasswordRequestForm = Depends(), db: Session = Depends(get_db)):
+    # Find user by username
+    user = db.query(User).filter(User.username == form_data.username).first()
+    if not user or not verify_password(form_data.password, user.password_hash):
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect username or password",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+    
+    # Create access token
+    access_token_expires = timedelta(minutes=settings.JWT_EXPIRATION_MINUTES)
+    access_token = create_access_token(
+        data={"sub": user.uuid}, expires_delta=access_token_expires
+    )
+    
+    return {"access_token": access_token, "token_type": "bearer"}
+
+@router.post("/register", response_model=User)
+def register(user: UserCreate, db: Session = Depends(get_db)):
+    # Check if user already exists
+    db_user = db.query(User).filter(User.username == user.username).first()
+    if db_user:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Username already registered",
+        )
+    
+    # Create new user
+    new_user = User(
+        uuid=str(uuid.uuid4()),
+        username=user.username,
+        user_type=user.user_type,
+        status=user.status
+    )
+    new_user.set_password(user.password)
+    
+    db.add(new_user)
+    db.commit()
+    db.refresh(new_user)
+    
+    return new_user
+
+@router.get("/me", response_model=User)
+def read_users_me(token: str = Depends(oauth2_scheme), db: Session = Depends(get_db)):
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    
+    payload = decode_access_token(token)
+    if payload is None:
+        raise credentials_exception
+    
+    uuid: str = payload.get("sub")
+    if uuid is None:
+        raise credentials_exception
+    
+    user = db.query(User).filter(User.uuid == uuid).first()
+    if user is None:
+        raise credentials_exception
+    
+    return user
\ No newline at end of file
diff --git a/fastapi-backend/app/api/orders.py b/fastapi-backend/app/api/orders.py
new file mode 100644
index 0000000..f568a39
--- /dev/null
+++ b/fastapi-backend/app/api/orders.py
@@ -0,0 +1,72 @@
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+from typing import List
+from app.db.database import get_db
+from app.models.order import Order
+from app.schemas.order import Order, OrderCreate, OrderUpdate
+import uuid
+
+router = APIRouter()
+
+@router.get("/", response_model=List[Order])
+def read_orders(skip: int = 0, limit: int = 100, db: Session = Depends(get_db)):
+    orders = db.query(Order).offset(skip).limit(limit).all()
+    return orders
+
+@router.get("/{order_id}", response_model=Order)
+def read_order(order_id: int, db: Session = Depends(get_db)):
+    db_order = db.query(Order).filter(Order.id == order_id).first()
+    if db_order is None:
+        raise HTTPException(status_code=404, detail="Order not found")
+    return db_order
+
+@router.post("/", response_model=Order)
+def create_order(order: OrderCreate, db: Session = Depends(get_db)):
+    # Generate unique order number
+    order_no = f"ORD{uuid.uuid4().hex[:16].upper()}"
+    
+    db_order = Order(
+        order_no=order_no,
+        buyer_id=order.buyer_id,
+        seller_id=order.seller_id,
+        variety_type=order.variety_type,
+        weight_range=order.weight_range,
+        weight_actual=order.weight_actual,
+        price_per_unit=order.price_per_unit,
+        total_price=order.total_price,
+        advance_payment=order.advance_payment,
+        final_payment=order.final_payment,
+        status=order.status,
+        delivery_address=order.delivery_address,
+        delivery_time=order.delivery_time,
+        remark=order.remark
+    )
+    
+    db.add(db_order)
+    db.commit()
+    db.refresh(db_order)
+    return db_order
+
+@router.put("/{order_id}", response_model=Order)
+def update_order(order_id: int, order: OrderUpdate, db: Session = Depends(get_db)):
+    db_order = db.query(Order).filter(Order.id == order_id).first()
+    if db_order is None:
+        raise HTTPException(status_code=404, detail="Order not found")
+    
+    # Update order fields
+    for field, value in order.dict(exclude_unset=True).items():
+        setattr(db_order, field, value)
+    
+    db.commit()
+    db.refresh(db_order)
+    return db_order
+
+@router.delete("/{order_id}", response_model=Order)
+def delete_order(order_id: int, db: Session = Depends(get_db)):
+    db_order = db.query(Order).filter(Order.id == order_id).first()
+    if db_order is None:
+        raise HTTPException(status_code=404, detail="Order not found")
+    
+    db.delete(db_order)
+    db.commit()
+    return db_order
\ No newline at end of file
diff --git a/fastapi-backend/app/api/payments.py b/fastapi-backend/app/api/payments.py
new file mode 100644
index 0000000..7f6f07a
--- /dev/null
+++ b/fastapi-backend/app/api/payments.py
@@ -0,0 +1,66 @@
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+from typing import List
+from app.db.database import get_db
+from app.models.payment import Payment
+from app.schemas.payment import Payment, PaymentCreate, PaymentUpdate
+import uuid
+
+router = APIRouter()
+
+@router.get("/", response_model=List[Payment])
+def read_payments(skip: int = 0, limit: int = 100, db: Session = Depends(get_db)):
+    payments = db.query(Payment).offset(skip).limit(limit).all()
+    return payments
+
+@router.get("/{payment_id}", response_model=Payment)
+def read_payment(payment_id: int, db: Session = Depends(get_db)):
+    db_payment = db.query(Payment).filter(Payment.id == payment_id).first()
+    if db_payment is None:
+        raise HTTPException(status_code=404, detail="Payment not found")
+    return db_payment
+
+@router.post("/", response_model=Payment)
+def create_payment(payment: PaymentCreate, db: Session = Depends(get_db)):
+    # Generate unique payment number
+    payment_no = f"PMT{uuid.uuid4().hex[:16].upper()}"
+    
+    db_payment = Payment(
+        payment_no=payment_no,
+        order_id=payment.order_id,
+        user_id=payment.user_id,
+        amount=payment.amount,
+        payment_type=payment.payment_type,
+        payment_method=payment.payment_method,
+        status=payment.status,
+        transaction_id=payment.transaction_id
+    )
+    
+    db.add(db_payment)
+    db.commit()
+    db.refresh(db_payment)
+    return db_payment
+
+@router.put("/{payment_id}", response_model=Payment)
+def update_payment(payment_id: int, payment: PaymentUpdate, db: Session = Depends(get_db)):
+    db_payment = db.query(Payment).filter(Payment.id == payment_id).first()
+    if db_payment is None:
+        raise HTTPException(status_code=404, detail="Payment not found")
+    
+    # Update payment fields
+    for field, value in payment.dict(exclude_unset=True).items():
+        setattr(db_payment, field, value)
+    
+    db.commit()
+    db.refresh(db_payment)
+    return db_payment
+
+@router.delete("/{payment_id}", response_model=Payment)
+def delete_payment(payment_id: int, db: Session = Depends(get_db)):
+    db_payment = db.query(Payment).filter(Payment.id == payment_id).first()
+    if db_payment is None:
+        raise HTTPException(status_code=404, detail="Payment not found")
+    
+    db.delete(db_payment)
+    db.commit()
+    return db_payment
\ No newline at end of file
diff --git a/fastapi-backend/app/api/users.py b/fastapi-backend/app/api/users.py
new file mode 100644
index 0000000..d9093ab
--- /dev/null
+++ b/fastapi-backend/app/api/users.py
@@ -0,0 +1,49 @@
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+from typing import List
+from app.db.database import get_db
+from app.models.user import User
+from app.schemas.user import User, UserCreate, UserUpdate
+from app.api.auth import oauth2_scheme
+
+router = APIRouter()
+
+@router.get("/", response_model=List[User])
+def read_users(skip: int = 0, limit: int = 100, db: Session = Depends(get_db)):
+    users = db.query(User).offset(skip).limit(limit).all()
+    return users
+
+@router.get("/{user_id}", response_model=User)
+def read_user(user_id: int, db: Session = Depends(get_db)):
+    db_user = db.query(User).filter(User.id == user_id).first()
+    if db_user is None:
+        raise HTTPException(status_code=404, detail="User not found")
+    return db_user
+
+@router.put("/{user_id}", response_model=User)
+def update_user(user_id: int, user: UserUpdate, db: Session = Depends(get_db)):
+    db_user = db.query(User).filter(User.id == user_id).first()
+    if db_user is None:
+        raise HTTPException(status_code=404, detail="User not found")
+    
+    # Update user fields
+    if user.username is not None:
+        db_user.username = user.username
+    if user.user_type is not None:
+        db_user.user_type = user.user_type
+    if user.status is not None:
+        db_user.status = user.status
+    
+    db.commit()
+    db.refresh(db_user)
+    return db_user
+
+@router.delete("/{user_id}", response_model=User)
+def delete_user(user_id: int, db: Session = Depends(get_db)):
+    db_user = db.query(User).filter(User.id == user_id).first()
+    if db_user is None:
+        raise HTTPException(status_code=404, detail="User not found")
+    
+    db.delete(db_user)
+    db.commit()
+    return db_user
\ No newline at end of file
diff --git a/fastapi-backend/app/core/__init__.py b/fastapi-backend/app/core/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/fastapi-backend/app/core/config.py b/fastapi-backend/app/core/config.py
new file mode 100644
index 0000000..4f1d288
--- /dev/null
+++ b/fastapi-backend/app/core/config.py
@@ -0,0 +1,24 @@
+import os
+from pydantic_settings import BaseSettings
+
+class Settings(BaseSettings):
+    # Database configuration
+    DB_HOST: str = os.getenv("DB_HOST", "localhost")
+    DB_PORT: int = int(os.getenv("DB_PORT", 3306))
+    DB_USER: str = os.getenv("DB_USER", "root")
+    DB_PASSWORD: str = os.getenv("DB_PASSWORD", "password")
+    DB_NAME: str = os.getenv("DB_NAME", "niumall_dev")
+    
+    # JWT configuration
+    JWT_SECRET: str = os.getenv("JWT_SECRET", "niumall-jwt-secret")
+    JWT_ALGORITHM: str = os.getenv("JWT_ALGORITHM", "HS256")
+    JWT_EXPIRATION_MINUTES: int = int(os.getenv("JWT_EXPIRATION_MINUTES", 1440))
+    
+    # Server configuration
+    SERVER_HOST: str = os.getenv("SERVER_HOST", "0.0.0.0")
+    SERVER_PORT: int = int(os.getenv("SERVER_PORT", 8000))
+    
+    class Config:
+        env_file = ".env"
+
+settings = Settings()
\ No newline at end of file
diff --git a/fastapi-backend/app/core/security.py b/fastapi-backend/app/core/security.py
new file mode 100644
index 0000000..40d49ca
--- /dev/null
+++ b/fastapi-backend/app/core/security.py
@@ -0,0 +1,30 @@
+from datetime import datetime, timedelta
+from typing import Optional
+from jose import JWTError, jwt
+from passlib.context import CryptContext
+from app.core.config import settings
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+def verify_password(plain_password, hashed_password):
+    return pwd_context.verify(plain_password, hashed_password)
+
+def get_password_hash(password):
+    return pwd_context.hash(password)
+
+def create_access_token(data: dict, expires_delta: Optional[timedelta] = None):
+    to_encode = data.copy()
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(minutes=settings.JWT_EXPIRATION_MINUTES)
+    to_encode.update({"exp": expire})
+    encoded_jwt = jwt.encode(to_encode, settings.JWT_SECRET, algorithm=settings.JWT_ALGORITHM)
+    return encoded_jwt
+
+def decode_access_token(token: str):
+    try:
+        payload = jwt.decode(token, settings.JWT_SECRET, algorithms=[settings.JWT_ALGORITHM])
+        return payload
+    except JWTError:
+        return None
\ No newline at end of file
diff --git a/fastapi-backend/app/db/__init__.py b/fastapi-backend/app/db/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/fastapi-backend/app/db/database.py b/fastapi-backend/app/db/database.py
new file mode 100644
index 0000000..3374edf
--- /dev/null
+++ b/fastapi-backend/app/db/database.py
@@ -0,0 +1,24 @@
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+from app.core.config import settings
+
+# Create database URL
+SQLALCHEMY_DATABASE_URL = f"mysql+pymysql://{settings.DB_USER}:{settings.DB_PASSWORD}@{settings.DB_HOST}:{settings.DB_PORT}/{settings.DB_NAME}"
+
+# Create engine
+engine = create_engine(SQLALCHEMY_DATABASE_URL, echo=True, pool_pre_ping=True)
+
+# Create session
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+# Base class for models
+Base = declarative_base()
+
+# Dependency to get DB session
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
\ No newline at end of file
diff --git a/fastapi-backend/app/main.py b/fastapi-backend/app/main.py
new file mode 100644
index 0000000..f1f1449
--- /dev/null
+++ b/fastapi-backend/app/main.py
@@ -0,0 +1,45 @@
+from fastapi import FastAPI, Request, Depends
+from fastapi.middleware.cors import CORSMiddleware
+from app.api import auth, users, orders, payments
+from app.core.config import settings
+from app.db.database import engine, Base
+from app.middleware.error_handler import error_handler
+from fastapi.exceptions import RequestValidationError
+from starlette.exceptions import HTTPException as StarletteHTTPException
+
+# Create database tables
+Base.metadata.create_all(bind=engine)
+
+app = FastAPI(
+    title="活牛采购智能数字化系统API",
+    description="活牛采购智能数字化系统后端API接口",
+    version="1.0.0",
+)
+
+# Add CORS middleware
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],  # In production, specify exact origins
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Add exception handlers
+app.add_exception_handler(StarletteHTTPException, error_handler)
+app.add_exception_handler(RequestValidationError, error_handler)
+app.add_exception_handler(Exception, error_handler)
+
+# Include routers
+app.include_router(auth.router, prefix="/api/auth", tags=["auth"])
+app.include_router(users.router, prefix="/api/users", tags=["users"])
+app.include_router(orders.router, prefix="/api/orders", tags=["orders"])
+app.include_router(payments.router, prefix="/api/payments", tags=["payments"])
+
+@app.get("/")
+async def root():
+    return {"message": "活牛采购智能数字化系统后端服务", "version": "1.0.0"}
+
+@app.get("/health")
+async def health_check():
+    return {"status": "healthy"}
\ No newline at end of file
diff --git a/fastapi-backend/app/middleware/__init__.py b/fastapi-backend/app/middleware/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/fastapi-backend/app/middleware/auth.py b/fastapi-backend/app/middleware/auth.py
new file mode 100644
index 0000000..dd45048
--- /dev/null
+++ b/fastapi-backend/app/middleware/auth.py
@@ -0,0 +1,39 @@
+from fastapi import HTTPException, status, Depends
+from fastapi.security import OAuth2PasswordBearer
+from sqlalchemy.orm import Session
+from app.db.database import get_db
+from app.models.user import User
+from app.core.security import decode_access_token
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="api/auth/login")
+
+def get_current_user(token: str = Depends(oauth2_scheme), db: Session = Depends(get_db)):
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    
+    payload = decode_access_token(token)
+    if payload is None:
+        raise credentials_exception
+    
+    uuid: str = payload.get("sub")
+    if uuid is None:
+        raise credentials_exception
+    
+    user = db.query(User).filter(User.uuid == uuid).first()
+    if user is None:
+        raise credentials_exception
+    
+    return user
+
+def require_role(required_role: str):
+    def role_checker(current_user: User = Depends(get_current_user)):
+        if current_user.user_type != required_role:
+            raise HTTPException(
+                status_code=status.HTTP_403_FORBIDDEN,
+                detail="Insufficient permissions",
+            )
+        return current_user
+    return role_checker
\ No newline at end of file
diff --git a/fastapi-backend/app/middleware/error_handler.py b/fastapi-backend/app/middleware/error_handler.py
new file mode 100644
index 0000000..56b225a
--- /dev/null
+++ b/fastapi-backend/app/middleware/error_handler.py
@@ -0,0 +1,25 @@
+from fastapi import HTTPException, Request
+from fastapi.responses import JSONResponse
+from app.utils.response import ErrorResponse
+
+async def error_handler(request: Request, exc: Exception):
+    # Handle HTTP exceptions
+    if isinstance(exc, HTTPException):
+        return JSONResponse(
+            status_code=exc.status_code,
+            content=ErrorResponse(
+                code=exc.status_code,
+                message=exc.detail,
+                data=None
+            ).dict()
+        )
+    
+    # Handle general exceptions
+    return JSONResponse(
+        status_code=500,
+        content=ErrorResponse(
+            code=500,
+            message="Internal Server Error",
+            data=str(exc)
+        ).dict()
+    )
\ No newline at end of file
diff --git a/fastapi-backend/app/models/__init__.py b/fastapi-backend/app/models/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/fastapi-backend/app/models/order.py b/fastapi-backend/app/models/order.py
new file mode 100644
index 0000000..0b9d26b
--- /dev/null
+++ b/fastapi-backend/app/models/order.py
@@ -0,0 +1,33 @@
+from sqlalchemy import Column, Integer, String, Float, Enum, DateTime, Text, func, ForeignKey
+from app.db.database import Base
+from enum import Enum as PyEnum
+
+class OrderStatus(str, PyEnum):
+    PENDING = "pending"
+    CONFIRMED = "confirmed"
+    PROCESSING = "processing"
+    SHIPPED = "shipped"
+    DELIVERED = "delivered"
+    CANCELLED = "cancelled"
+    COMPLETED = "completed"
+
+class Order(Base):
+    __tablename__ = "orders"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    order_no = Column(String(32), unique=True, index=True, nullable=False)
+    buyer_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    seller_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    variety_type = Column(String(50), nullable=False)
+    weight_range = Column(String(50), nullable=False)
+    weight_actual = Column(Float, nullable=True)
+    price_per_unit = Column(Float, nullable=False)
+    total_price = Column(Float, nullable=False)
+    advance_payment = Column(Float, nullable=False, default=0.0)
+    final_payment = Column(Float, nullable=False, default=0.0)
+    status = Column(Enum(OrderStatus), default=OrderStatus.PENDING, nullable=False)
+    delivery_address = Column(Text, nullable=True)
+    delivery_time = Column(DateTime, nullable=True)
+    remark = Column(Text, nullable=True)
+    created_at = Column(DateTime, default=func.now(), nullable=False)
+    updated_at = Column(DateTime, default=func.now(), onupdate=func.now(), nullable=False)
\ No newline at end of file
diff --git a/fastapi-backend/app/models/payment.py b/fastapi-backend/app/models/payment.py
new file mode 100644
index 0000000..4e541f6
--- /dev/null
+++ b/fastapi-backend/app/models/payment.py
@@ -0,0 +1,33 @@
+from sqlalchemy import Column, Integer, String, Float, Enum, DateTime, ForeignKey, func
+from app.db.database import Base
+from enum import Enum as PyEnum
+
+class PaymentType(str, PyEnum):
+    ADVANCE = "advance"
+    FINAL = "final"
+
+class PaymentMethod(str, PyEnum):
+    WECHAT = "wechat"
+    ALIPAY = "alipay"
+    BANK = "bank"
+
+class PaymentStatus(str, PyEnum):
+    PENDING = "pending"
+    SUCCESS = "success"
+    FAILED = "failed"
+    REFUNDED = "refunded"
+
+class Payment(Base):
+    __tablename__ = "payments"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    order_id = Column(Integer, ForeignKey("orders.id"), nullable=False)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    payment_no = Column(String(32), unique=True, index=True, nullable=False)
+    amount = Column(Float, nullable=False)
+    payment_type = Column(Enum(PaymentType), nullable=False)
+    payment_method = Column(Enum(PaymentMethod), nullable=False)
+    status = Column(Enum(PaymentStatus), default=PaymentStatus.PENDING, nullable=False)
+    transaction_id = Column(String(128), nullable=True)
+    created_at = Column(DateTime, default=func.now(), nullable=False)
+    updated_at = Column(DateTime, default=func.now(), onupdate=func.now(), nullable=False)
\ No newline at end of file
diff --git a/fastapi-backend/app/models/user.py b/fastapi-backend/app/models/user.py
new file mode 100644
index 0000000..ed84dab
--- /dev/null
+++ b/fastapi-backend/app/models/user.py
@@ -0,0 +1,36 @@
+from sqlalchemy import Column, Integer, String, Enum, DateTime, func
+from app.db.database import Base
+from passlib.context import CryptContext
+from enum import Enum as PyEnum
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+class UserType(str, PyEnum):
+    CLIENT = "client"
+    SUPPLIER = "supplier"
+    DRIVER = "driver"
+    STAFF = "staff"
+    ADMIN = "admin"
+
+class UserStatus(str, PyEnum):
+    ACTIVE = "active"
+    INACTIVE = "inactive"
+    LOCKED = "locked"
+
+class User(Base):
+    __tablename__ = "users"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    uuid = Column(String(36), unique=True, index=True, nullable=False)
+    username = Column(String(50), unique=True, index=True, nullable=False)
+    password_hash = Column(String(128), nullable=False)
+    user_type = Column(Enum(UserType), default=UserType.CLIENT, nullable=False)
+    status = Column(Enum(UserStatus), default=UserStatus.ACTIVE, nullable=False)
+    created_at = Column(DateTime, default=func.now(), nullable=False)
+    updated_at = Column(DateTime, default=func.now(), onupdate=func.now(), nullable=False)
+    
+    def verify_password(self, plain_password):
+        return pwd_context.verify(plain_password, self.password_hash)
+    
+    def set_password(self, plain_password):
+        self.password_hash = pwd_context.hash(plain_password)
\ No newline at end of file
diff --git a/fastapi-backend/app/schemas/__init__.py b/fastapi-backend/app/schemas/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/fastapi-backend/app/schemas/order.py b/fastapi-backend/app/schemas/order.py
new file mode 100644
index 0000000..b4eecb7
--- /dev/null
+++ b/fastapi-backend/app/schemas/order.py
@@ -0,0 +1,58 @@
+from pydantic import BaseModel
+from typing import Optional
+from datetime import datetime
+from enum import Enum
+
+class OrderStatus(str, Enum):
+    PENDING = "pending"
+    CONFIRMED = "confirmed"
+    PROCESSING = "processing"
+    SHIPPED = "shipped"
+    DELIVERED = "delivered"
+    CANCELLED = "cancelled"
+    COMPLETED = "completed"
+
+class OrderBase(BaseModel):
+    buyer_id: int
+    seller_id: int
+    variety_type: str
+    weight_range: str
+    weight_actual: Optional[float] = None
+    price_per_unit: float
+    total_price: float
+    advance_payment: float = 0.0
+    final_payment: float = 0.0
+    status: OrderStatus = OrderStatus.PENDING
+    delivery_address: Optional[str] = None
+    delivery_time: Optional[datetime] = None
+    remark: Optional[str] = None
+
+class OrderCreate(OrderBase):
+    pass
+
+class OrderUpdate(BaseModel):
+    buyer_id: Optional[int] = None
+    seller_id: Optional[int] = None
+    variety_type: Optional[str] = None
+    weight_range: Optional[str] = None
+    weight_actual: Optional[float] = None
+    price_per_unit: Optional[float] = None
+    total_price: Optional[float] = None
+    advance_payment: Optional[float] = None
+    final_payment: Optional[float] = None
+    status: Optional[OrderStatus] = None
+    delivery_address: Optional[str] = None
+    delivery_time: Optional[datetime] = None
+    remark: Optional[str] = None
+
+class OrderInDBBase(OrderBase):
+    id: int
+    order_no: str
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        orm_mode = True
+
+class Order(OrderInDBBase):
+    pass
\ No newline at end of file
diff --git a/fastapi-backend/app/schemas/payment.py b/fastapi-backend/app/schemas/payment.py
new file mode 100644
index 0000000..b19da9f
--- /dev/null
+++ b/fastapi-backend/app/schemas/payment.py
@@ -0,0 +1,52 @@
+from pydantic import BaseModel
+from typing import Optional
+from datetime import datetime
+from enum import Enum
+
+class PaymentType(str, Enum):
+    ADVANCE = "advance"
+    FINAL = "final"
+
+class PaymentMethod(str, Enum):
+    WECHAT = "wechat"
+    ALIPAY = "alipay"
+    BANK = "bank"
+
+class PaymentStatus(str, Enum):
+    PENDING = "pending"
+    SUCCESS = "success"
+    FAILED = "failed"
+    REFUNDED = "refunded"
+
+class PaymentBase(BaseModel):
+    order_id: int
+    user_id: int
+    amount: float
+    payment_type: PaymentType
+    payment_method: PaymentMethod
+    status: PaymentStatus = PaymentStatus.PENDING
+    transaction_id: Optional[str] = None
+
+class PaymentCreate(PaymentBase):
+    pass
+
+class PaymentUpdate(BaseModel):
+    order_id: Optional[int] = None
+    user_id: Optional[int] = None
+    amount: Optional[float] = None
+    payment_type: Optional[PaymentType] = None
+    payment_method: Optional[PaymentMethod] = None
+    status: Optional[PaymentStatus] = None
+    transaction_id: Optional[str] = None
+
+class PaymentInDBBase(PaymentBase):
+    id: int
+    payment_no: str
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        orm_mode = True
+
+class Payment(PaymentInDBBase):
+    pass
\ No newline at end of file
diff --git a/fastapi-backend/app/schemas/user.py b/fastapi-backend/app/schemas/user.py
new file mode 100644
index 0000000..7b31e57
--- /dev/null
+++ b/fastapi-backend/app/schemas/user.py
@@ -0,0 +1,51 @@
+from pydantic import BaseModel
+from typing import Optional
+from datetime import datetime
+from enum import Enum
+
+class UserType(str, Enum):
+    CLIENT = "client"
+    SUPPLIER = "supplier"
+    DRIVER = "driver"
+    STAFF = "staff"
+    ADMIN = "admin"
+
+class UserStatus(str, Enum):
+    ACTIVE = "active"
+    INACTIVE = "inactive"
+    LOCKED = "locked"
+
+class UserBase(BaseModel):
+    username: str
+    user_type: UserType = UserType.CLIENT
+    status: UserStatus = UserStatus.ACTIVE
+
+class UserCreate(UserBase):
+    password: str
+
+class UserUpdate(BaseModel):
+    username: Optional[str] = None
+    user_type: Optional[UserType] = None
+    status: Optional[UserStatus] = None
+
+class UserInDBBase(UserBase):
+    id: int
+    uuid: str
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        orm_mode = True
+
+class User(UserInDBBase):
+    pass
+
+class UserInDB(UserInDBBase):
+    password_hash: str
+
+class Token(BaseModel):
+    access_token: str
+    token_type: str
+
+class TokenData(BaseModel):
+    uuid: Optional[str] = None
\ No newline at end of file
diff --git a/fastapi-backend/app/utils/response.py b/fastapi-backend/app/utils/response.py
new file mode 100644
index 0000000..5212ff8
--- /dev/null
+++ b/fastapi-backend/app/utils/response.py
@@ -0,0 +1,26 @@
+from typing import Any, Optional, Generic, TypeVar
+from pydantic import BaseModel
+from datetime import datetime
+
+T = TypeVar('T')
+
+class SuccessResponse(BaseModel, Generic[T]):
+    code: int = 200
+    message: str = "Success"
+    data: Optional[T] = None
+    timestamp: datetime = datetime.now()
+
+class ErrorResponse(BaseModel):
+    code: int = 500
+    message: str = "Internal Server Error"
+    data: Optional[Any] = None
+    timestamp: datetime = datetime.now()
+
+class PaginatedResponse(BaseModel, Generic[T]):
+    code: int = 200
+    message: str = "Success"
+    data: Optional[T] = None
+    timestamp: datetime = datetime.now()
+    total: int
+    page: int
+    limit: int
\ No newline at end of file
diff --git a/fastapi-backend/requirements.txt b/fastapi-backend/requirements.txt
new file mode 100644
index 0000000..6dcf563
--- /dev/null
+++ b/fastapi-backend/requirements.txt
@@ -0,0 +1,10 @@
+fastapi==0.68.0
+uvicorn[standard]==0.15.0
+sqlalchemy==1.4.23
+databases[mysql]==0.5.3
+pydantic==1.8.2
+python-jose[cryptography]==3.3.0
+passlib[bcrypt]==1.7.4
+python-multipart==0.0.5
+alembic==1.7.1
+python-dotenv==0.18.0
\ No newline at end of file
diff --git a/go-backend/.env.example b/go-backend/.env.example
new file mode 100644
index 0000000..7a39461
--- /dev/null
+++ b/go-backend/.env.example
@@ -0,0 +1,13 @@
+# Database configuration
+DB_HOST=localhost
+DB_PORT=3306
+DB_USER=root
+DB_PASSWORD=
+DB_NAME=niumall_go
+
+# Server configuration
+PORT=8080
+GIN_MODE=debug
+
+# JWT configuration
+JWT_SECRET=your-secret-key-here
\ No newline at end of file
diff --git a/go-backend/.gitignore b/go-backend/.gitignore
new file mode 100644
index 0000000..e874029
--- /dev/null
+++ b/go-backend/.gitignore
@@ -0,0 +1,35 @@
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with go test -c
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories
+vendor/
+
+# Go workspace file
+go.work
+
+# Environment files
+.env
+
+# IDE-specific files
+.vscode/
+.idea/
+
+# Docker
+docker-compose.override.yml
+
+# Log files
+*.log
+
+# Build outputs
+main
+bin/
\ No newline at end of file
diff --git a/go-backend/Dockerfile b/go-backend/Dockerfile
new file mode 100644
index 0000000..d5781da
--- /dev/null
+++ b/go-backend/Dockerfile
@@ -0,0 +1,44 @@
+# 使用国内镜像源的Go镜像作为构建环境
+FROM golang:1.21-alpine AS builder
+
+# 设置工作目录
+WORKDIR /app
+
+# 复制go.mod和go.sum文件
+COPY go.mod go.sum ./
+
+# 为apk包管理器配置国内镜像源
+RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories
+
+# 下载依赖
+RUN go mod download
+
+# 复制源代码
+COPY . .
+
+# 构建应用
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o main .
+
+# 使用Alpine Linux作为运行环境
+FROM alpine:latest
+
+# 为apk包管理器配置国内镜像源
+RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories
+
+# 安装ca-certificates以支持HTTPS请求
+RUN apk --no-cache add ca-certificates
+
+# 设置工作目录
+WORKDIR /root/
+
+# 从构建阶段复制二进制文件
+COPY --from=builder /app/main .
+
+# 复制环境配置文件
+COPY --from=builder /app/.env.example .env
+
+# 暴露端口
+EXPOSE 8080
+
+# 运行应用
+CMD ["./main"]
\ No newline at end of file
diff --git a/go-backend/Makefile b/go-backend/Makefile
new file mode 100644
index 0000000..fad93be
--- /dev/null
+++ b/go-backend/Makefile
@@ -0,0 +1,50 @@
+# 定义变量
+BINARY_NAME=main
+DOCKER_IMAGE_NAME=niumall-go-backend
+
+# 默认目标
+.PHONY: help
+help: ## 显示帮助信息
+	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'
+
+.PHONY: build
+build: ## 构建Go应用
+	go build -o ${BINARY_NAME} .
+
+.PHONY: run
+run: ## 运行Go应用
+	go run main.go
+
+.PHONY: test
+test: ## 运行单元测试
+	go test -v ./...
+
+.PHONY: clean
+clean: ## 清理构建文件
+	rm -f ${BINARY_NAME}
+
+.PHONY: docker-build
+docker-build: ## 构建Docker镜像
+	docker build -t ${DOCKER_IMAGE_NAME} .
+
+.PHONY: docker-run
+docker-run: ## 运行Docker容器
+	docker run -p 8080:8080 ${DOCKER_IMAGE_NAME}
+
+.PHONY: docker-compose-up
+docker-compose-up: ## 使用docker-compose启动服务
+	docker-compose up -d
+
+.PHONY: docker-compose-down
+docker-compose-down: ## 使用docker-compose停止服务
+	docker-compose down
+
+.PHONY: migrate-up
+migrate-up: ## 运行数据库迁移(如果有的话)
+	@echo "运行数据库迁移..."
+	# 在这里添加数据库迁移命令
+
+.PHONY: migrate-down
+migrate-down: ## 回滚数据库迁移(如果有的话)
+	@echo "回滚数据库迁移..."
+	# 在这里添加数据库回滚命令
\ No newline at end of file
diff --git a/go-backend/README.md b/go-backend/README.md
new file mode 100644
index 0000000..7e4a6f6
--- /dev/null
+++ b/go-backend/README.md
@@ -0,0 +1,30 @@
+# Go Backend for Niumall
+
+This is the Go implementation of the Niumall backend using the Gin framework.
+
+## Project Structure
+
+```
+go-backend/
+├── README.md
+├── go.mod
+├── go.sum
+├── main.go
+├── config/
+├── models/
+├── routes/
+├── controllers/
+├── middleware/
+├── utils/
+└── docs/
+```
+
+## Getting Started
+
+1. Install Go (version 1.16 or later)
+2. Run `go mod tidy` to install dependencies
+3. Run `go run main.go` to start the server
+
+## API Documentation
+
+API documentation is available in the `docs/` directory.
\ No newline at end of file
diff --git a/go-backend/config/database.go b/go-backend/config/database.go
new file mode 100644
index 0000000..2b00d2a
--- /dev/null
+++ b/go-backend/config/database.go
@@ -0,0 +1,33 @@
+package config
+
+import (
+	"log"
+	"os"
+
+	"gorm.io/driver/mysql"
+	"gorm.io/gorm"
+)
+
+var DB *gorm.DB
+
+func InitDB() {
+	var err error
+	
+	// Get database configuration from environment variables
+	host := os.Getenv("DB_HOST")
+	port := os.Getenv("DB_PORT")
+	user := os.Getenv("DB_USER")
+	password := os.Getenv("DB_PASSWORD")
+	dbname := os.Getenv("DB_NAME")
+	
+	// Create DSN (Data Source Name)
+	dsn := user + ":" + password + "@tcp(" + host + ":" + port + ")/" + dbname + "?charset=utf8mb4&parseTime=True&loc=Local"
+	
+	// Connect to database
+	DB, err = gorm.Open(mysql.Open(dsn), &gorm.Config{})
+	if err != nil {
+		log.Fatal("Failed to connect to database:", err)
+	}
+	
+	log.Println("Database connection established")
+}
\ No newline at end of file
diff --git a/go-backend/controllers/order_controller.go b/go-backend/controllers/order_controller.go
new file mode 100644
index 0000000..c319746
--- /dev/null
+++ b/go-backend/controllers/order_controller.go
@@ -0,0 +1,177 @@
+package controllers
+
+import (
+	"net/http"
+	"strconv"
+
+	"github.com/gin-gonic/gin"
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+
+	"niumall-go/config"
+	"niumall-go/models"
+)
+
+// GetOrders retrieves a list of orders with pagination
+func GetOrders(c *gin.Context) {
+	var orders []models.Order
+	skip, _ := strconv.Atoi(c.DefaultQuery("skip", "0"))
+	limit, _ := strconv.Atoi(c.DefaultQuery("limit", "100"))
+
+	if err := config.DB.Offset(skip).Limit(limit).Find(&orders).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, orders)
+}
+
+// GetOrderByID retrieves an order by ID
+func GetOrderByID(c *gin.Context) {
+	id := c.Param("id")
+	var order models.Order
+
+	if err := config.DB.First(&order, id).Error; err != nil {
+		if err == gorm.ErrRecordNotFound {
+			c.JSON(http.StatusNotFound, gin.H{"error": "Order not found"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, order)
+}
+
+// CreateOrder creates a new order
+func CreateOrder(c *gin.Context) {
+	var input models.Order
+	if err := c.ShouldBindJSON(&input); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	// Generate unique order number
+	orderNo := "ORD" + uuid.New().String()[:16]
+
+	// Create order
+	order := models.Order{
+		OrderNo:        orderNo,
+		BuyerID:        input.BuyerID,
+		SellerID:       input.SellerID,
+		VarietyType:    input.VarietyType,
+		WeightRange:    input.WeightRange,
+		WeightActual:   input.WeightActual,
+		PricePerUnit:   input.PricePerUnit,
+		TotalPrice:     input.TotalPrice,
+		AdvancePayment: input.AdvancePayment,
+		FinalPayment:   input.FinalPayment,
+		Status:         input.Status,
+		DeliveryAddress: input.DeliveryAddress,
+		DeliveryTime:   input.DeliveryTime,
+		Remark:         input.Remark,
+	}
+
+	if err := config.DB.Create(&order).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, order)
+}
+
+// UpdateOrder updates an order's information
+func UpdateOrder(c *gin.Context) {
+	id := c.Param("id")
+	var order models.Order
+
+	// Check if order exists
+	if err := config.DB.First(&order, id).Error; err != nil {
+		if err == gorm.ErrRecordNotFound {
+			c.JSON(http.StatusNotFound, gin.H{"error": "Order not found"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	// Parse input
+	var input models.Order
+	if err := c.ShouldBindJSON(&input); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	// Update order fields
+	if input.BuyerID != 0 {
+		order.BuyerID = input.BuyerID
+	}
+	if input.SellerID != 0 {
+		order.SellerID = input.SellerID
+	}
+	if input.VarietyType != "" {
+		order.VarietyType = input.VarietyType
+	}
+	if input.WeightRange != "" {
+		order.WeightRange = input.WeightRange
+	}
+	if input.WeightActual != 0 {
+		order.WeightActual = input.WeightActual
+	}
+	if input.PricePerUnit != 0 {
+		order.PricePerUnit = input.PricePerUnit
+	}
+	if input.TotalPrice != 0 {
+		order.TotalPrice = input.TotalPrice
+	}
+	if input.AdvancePayment != 0 {
+		order.AdvancePayment = input.AdvancePayment
+	}
+	if input.FinalPayment != 0 {
+		order.FinalPayment = input.FinalPayment
+	}
+	if input.Status != "" {
+		order.Status = input.Status
+	}
+	if input.DeliveryAddress != "" {
+		order.DeliveryAddress = input.DeliveryAddress
+	}
+	if input.DeliveryTime != nil {
+		order.DeliveryTime = input.DeliveryTime
+	}
+	if input.Remark != "" {
+		order.Remark = input.Remark
+	}
+
+	// Save updated order
+	if err := config.DB.Save(&order).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, order)
+}
+
+// DeleteOrder deletes an order by ID
+func DeleteOrder(c *gin.Context) {
+	id := c.Param("id")
+	var order models.Order
+
+	// Check if order exists
+	if err := config.DB.First(&order, id).Error; err != nil {
+		if err == gorm.ErrRecordNotFound {
+			c.JSON(http.StatusNotFound, gin.H{"error": "Order not found"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	// Delete order
+	if err := config.DB.Delete(&order).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, order)
+}
\ No newline at end of file
diff --git a/go-backend/controllers/payment_controller.go b/go-backend/controllers/payment_controller.go
new file mode 100644
index 0000000..130c475
--- /dev/null
+++ b/go-backend/controllers/payment_controller.go
@@ -0,0 +1,153 @@
+package controllers
+
+import (
+	"net/http"
+	"strconv"
+
+	"github.com/gin-gonic/gin"
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+
+	"niumall-go/config"
+	"niumall-go/models"
+)
+
+// GetPayments retrieves a list of payments with pagination
+func GetPayments(c *gin.Context) {
+	var payments []models.Payment
+	skip, _ := strconv.Atoi(c.DefaultQuery("skip", "0"))
+	limit, _ := strconv.Atoi(c.DefaultQuery("limit", "100"))
+
+	if err := config.DB.Offset(skip).Limit(limit).Find(&payments).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, payments)
+}
+
+// GetPaymentByID retrieves a payment by ID
+func GetPaymentByID(c *gin.Context) {
+	id := c.Param("id")
+	var payment models.Payment
+
+	if err := config.DB.First(&payment, id).Error; err != nil {
+		if err == gorm.ErrRecordNotFound {
+			c.JSON(http.StatusNotFound, gin.H{"error": "Payment not found"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, payment)
+}
+
+// CreatePayment creates a new payment
+func CreatePayment(c *gin.Context) {
+	var input models.Payment
+	if err := c.ShouldBindJSON(&input); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	// Generate unique payment number
+	paymentNo := "PMT" + uuid.New().String()[:16]
+
+	// Create payment
+	payment := models.Payment{
+		PaymentNo:     paymentNo,
+		OrderID:       input.OrderID,
+		UserID:        input.UserID,
+		Amount:        input.Amount,
+		PaymentType:   input.PaymentType,
+		PaymentMethod: input.PaymentMethod,
+		Status:        input.Status,
+		TransactionID: input.TransactionID,
+	}
+
+	if err := config.DB.Create(&payment).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, payment)
+}
+
+// UpdatePayment updates a payment's information
+func UpdatePayment(c *gin.Context) {
+	id := c.Param("id")
+	var payment models.Payment
+
+	// Check if payment exists
+	if err := config.DB.First(&payment, id).Error; err != nil {
+		if err == gorm.ErrRecordNotFound {
+			c.JSON(http.StatusNotFound, gin.H{"error": "Payment not found"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	// Parse input
+	var input models.Payment
+	if err := c.ShouldBindJSON(&input); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	// Update payment fields
+	if input.OrderID != 0 {
+		payment.OrderID = input.OrderID
+	}
+	if input.UserID != 0 {
+		payment.UserID = input.UserID
+	}
+	if input.Amount != 0 {
+		payment.Amount = input.Amount
+	}
+	if input.PaymentType != "" {
+		payment.PaymentType = input.PaymentType
+	}
+	if input.PaymentMethod != "" {
+		payment.PaymentMethod = input.PaymentMethod
+	}
+	if input.Status != "" {
+		payment.Status = input.Status
+	}
+	if input.TransactionID != "" {
+		payment.TransactionID = input.TransactionID
+	}
+
+	// Save updated payment
+	if err := config.DB.Save(&payment).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, payment)
+}
+
+// DeletePayment deletes a payment by ID
+func DeletePayment(c *gin.Context) {
+	id := c.Param("id")
+	var payment models.Payment
+
+	// Check if payment exists
+	if err := config.DB.First(&payment, id).Error; err != nil {
+		if err == gorm.ErrRecordNotFound {
+			c.JSON(http.StatusNotFound, gin.H{"error": "Payment not found"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	// Delete payment
+	if err := config.DB.Delete(&payment).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, payment)
+}
\ No newline at end of file
diff --git a/go-backend/controllers/user_controller.go b/go-backend/controllers/user_controller.go
new file mode 100644
index 0000000..70b9e3d
--- /dev/null
+++ b/go-backend/controllers/user_controller.go
@@ -0,0 +1,153 @@
+package controllers
+
+import (
+	"net/http"
+	"strconv"
+
+	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
+
+	"niumall-go/config"
+	"niumall-go/models"
+	"niumall-go/utils"
+)
+
+// GetUserByID retrieves a user by ID
+func GetUserByID(c *gin.Context) {
+	id := c.Param("id")
+	var user models.User
+
+	if err := config.DB.First(&user, id).Error; err != nil {
+		if err == gorm.ErrRecordNotFound {
+			c.JSON(http.StatusNotFound, gin.H{"error": "User not found"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, user)
+}
+
+// GetUsers retrieves a list of users with pagination
+func GetUsers(c *gin.Context) {
+	var users []models.User
+	skip, _ := strconv.Atoi(c.DefaultQuery("skip", "0"))
+	limit, _ := strconv.Atoi(c.DefaultQuery("limit", "100"))
+
+	if err := config.DB.Offset(skip).Limit(limit).Find(&users).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, users)
+}
+
+// UpdateUser updates a user's information
+func UpdateUser(c *gin.Context) {
+	id := c.Param("id")
+	var user models.User
+
+	// Check if user exists
+	if err := config.DB.First(&user, id).Error; err != nil {
+		if err == gorm.ErrRecordNotFound {
+			c.JSON(http.StatusNotFound, gin.H{"error": "User not found"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	// Parse input
+	var input models.User
+	if err := c.ShouldBindJSON(&input); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	// Update user fields
+	if input.Username != "" {
+		user.Username = input.Username
+	}
+	if input.UserType != "" {
+		user.UserType = input.UserType
+	}
+	if input.Status != "" {
+		user.Status = input.Status
+	}
+
+	// Save updated user
+	if err := config.DB.Save(&user).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, user)
+}
+
+// DeleteUser deletes a user by ID
+func DeleteUser(c *gin.Context) {
+	id := c.Param("id")
+	var user models.User
+
+	// Check if user exists
+	if err := config.DB.First(&user, id).Error; err != nil {
+		if err == gorm.ErrRecordNotFound {
+			c.JSON(http.StatusNotFound, gin.H{"error": "User not found"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	// Delete user
+	if err := config.DB.Delete(&user).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, user)
+}
+
+// Login handles user login and returns a JWT token
+func Login(c *gin.Context) {
+	var input struct {
+		Username string `json:"username" binding:"required"`
+		Password string `json:"password" binding:"required"`
+	}
+
+	// Parse input
+	if err := c.ShouldBindJSON(&input); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	// Find user by username
+	var user models.User
+	if err := config.DB.Where("username = ?", input.Username).First(&user).Error; err != nil {
+		if err == gorm.ErrRecordNotFound {
+			c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid credentials"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	// Check password
+	if !utils.CheckPasswordHash(input.Password, user.Password) {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid credentials"})
+		return
+	}
+
+	// Generate JWT token
+	token, err := utils.GenerateJWT(user.UUID)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to generate token"})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{
+		"access_token": token,
+		"token_type":   "bearer",
+	})
+}
\ No newline at end of file
diff --git a/go-backend/docker-compose.yml b/go-backend/docker-compose.yml
new file mode 100644
index 0000000..9a3fce6
--- /dev/null
+++ b/go-backend/docker-compose.yml
@@ -0,0 +1,33 @@
+version: '3.8'
+
+services:
+  app:
+    build: .
+    ports:
+      - "8080:8080"
+    environment:
+      - DB_HOST=db
+      - DB_PORT=3306
+      - DB_USER=root
+      - DB_PASSWORD=rootpassword
+      - DB_NAME=niumall
+      - PORT=8080
+      - GIN_MODE=release
+      - JWT_SECRET=mysecretkey
+    depends_on:
+      - db
+    volumes:
+      - .env:/root/.env
+
+  db:
+    image: mysql:8.0
+    environment:
+      - MYSQL_ROOT_PASSWORD=rootpassword
+      - MYSQL_DATABASE=niumall
+    ports:
+      - "3306:3306"
+    volumes:
+      - db_data:/var/lib/mysql
+
+volumes:
+  db_data:
\ No newline at end of file
diff --git a/go-backend/docs/orders.yaml b/go-backend/docs/orders.yaml
new file mode 100644
index 0000000..fd5883c
--- /dev/null
+++ b/go-backend/docs/orders.yaml
@@ -0,0 +1,412 @@
+openapi: 3.0.0
+info:
+  title: 订单管理API
+  description: 订单管理相关接口文档
+  version: 1.0.0
+
+paths:
+  /api/orders:
+    get:
+      summary: 获取订单列表
+      description: 获取系统中的订单列表，支持分页（需要认证）
+      security:
+        - bearerAuth: []
+      parameters:
+        - name: skip
+          in: query
+          description: 跳过的记录数
+          required: false
+          schema:
+            type: integer
+            default: 0
+        - name: limit
+          in: query
+          description: 返回的记录数
+          required: false
+          schema:
+            type: integer
+            default: 100
+      responses:
+        '200':
+          description: 成功返回订单列表
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: '#/components/schemas/Order'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+    post:
+      summary: 创建订单
+      description: 创建一个新的订单（需要认证）
+      security:
+        - bearerAuth: []
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/OrderCreate'
+      responses:
+        '200':
+          description: 成功创建订单
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Order'
+        '400':
+          description: 请求参数验证失败
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+
+  /api/orders/{id}:
+    get:
+      summary: 获取订单详情
+      description: 根据订单ID获取订单详细信息（需要认证）
+      security:
+        - bearerAuth: []
+      parameters:
+        - name: id
+          in: path
+          description: 订单ID
+          required: true
+          schema:
+            type: integer
+      responses:
+        '200':
+          description: 成功返回订单信息
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Order'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '404':
+          description: 订单未找到
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+    put:
+      summary: 更新订单信息
+      description: 根据订单ID更新订单信息（需要认证）
+      security:
+        - bearerAuth: []
+      parameters:
+        - name: id
+          in: path
+          description: 订单ID
+          required: true
+          schema:
+            type: integer
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/OrderUpdate'
+      responses:
+        '200':
+          description: 成功更新订单信息
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Order'
+        '400':
+          description: 请求参数验证失败
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '404':
+          description: 订单未找到
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+    delete:
+      summary: 删除订单
+      description: 根据订单ID删除订单（需要认证）
+      security:
+        - bearerAuth: []
+      parameters:
+        - name: id
+          in: path
+          description: 订单ID
+          required: true
+          schema:
+            type: integer
+      responses:
+        '200':
+          description: 成功删除订单
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Order'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '404':
+          description: 订单未找到
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+
+components:
+  schemas:
+    Order:
+      type: object
+      properties:
+        id:
+          type: integer
+          description: 订单ID
+        order_no:
+          type: string
+          description: 订单号
+        buyer_id:
+          type: integer
+          description: 买家ID
+        seller_id:
+          type: integer
+          description: 卖家ID
+        variety_type:
+          type: string
+          description: 品种类型
+        weight_range:
+          type: string
+          description: 重量范围
+        weight_actual:
+          type: number
+          format: float
+          description: 实际重量
+        price_per_unit:
+          type: number
+          format: float
+          description: 单价
+        total_price:
+          type: number
+          format: float
+          description: 总价
+        advance_payment:
+          type: number
+          format: float
+          description: 预付款
+        final_payment:
+          type: number
+          format: float
+          description: 尾款
+        status:
+          type: string
+          enum: [pending, confirmed, processing, shipped, delivered, cancelled, completed]
+          description: 订单状态
+        delivery_address:
+          type: string
+          description: 收货地址
+        delivery_time:
+          type: string
+          format: date-time
+          description: 交付时间
+        remark:
+          type: string
+          description: 备注
+        created_at:
+          type: string
+          format: date-time
+          description: 创建时间
+        updated_at:
+          type: string
+          format: date-time
+          description: 更新时间
+      required:
+        - id
+        - order_no
+        - buyer_id
+        - seller_id
+        - variety_type
+        - weight_range
+        - price_per_unit
+        - total_price
+        - advance_payment
+        - final_payment
+        - status
+        - created_at
+        - updated_at
+
+    OrderCreate:
+      type: object
+      properties:
+        buyer_id:
+          type: integer
+          description: 买家ID
+        seller_id:
+          type: integer
+          description: 卖家ID
+        variety_type:
+          type: string
+          description: 品种类型
+        weight_range:
+          type: string
+          description: 重量范围
+        weight_actual:
+          type: number
+          format: float
+          description: 实际重量
+        price_per_unit:
+          type: number
+          format: float
+          description: 单价
+        total_price:
+          type: number
+          format: float
+          description: 总价
+        advance_payment:
+          type: number
+          format: float
+          description: 预付款
+        final_payment:
+          type: number
+          format: float
+          description: 尾款
+        status:
+          type: string
+          enum: [pending, confirmed, processing, shipped, delivered, cancelled, completed]
+          description: 订单状态
+        delivery_address:
+          type: string
+          description: 收货地址
+        delivery_time:
+          type: string
+          format: date-time
+          description: 交付时间
+        remark:
+          type: string
+          description: 备注
+      required:
+        - buyer_id
+        - seller_id
+        - variety_type
+        - weight_range
+        - price_per_unit
+        - total_price
+
+    OrderUpdate:
+      type: object
+      properties:
+        buyer_id:
+          type: integer
+          description: 买家ID
+        seller_id:
+          type: integer
+          description: 卖家ID
+        variety_type:
+          type: string
+          description: 品种类型
+        weight_range:
+          type: string
+          description: 重量范围
+        weight_actual:
+          type: number
+          format: float
+          description: 实际重量
+        price_per_unit:
+          type: number
+          format: float
+          description: 单价
+        total_price:
+          type: number
+          format: float
+          description: 总价
+        advance_payment:
+          type: number
+          format: float
+          description: 预付款
+        final_payment:
+          type: number
+          format: float
+          description: 尾款
+        status:
+          type: string
+          enum: [pending, confirmed, processing, shipped, delivered, cancelled, completed]
+          description: 订单状态
+        delivery_address:
+          type: string
+          description: 收货地址
+        delivery_time:
+          type: string
+          format: date-time
+          description: 交付时间
+        remark:
+          type: string
+          description: 备注
+
+    Error:
+      type: object
+      properties:
+        error:
+          type: string
+          description: 错误信息
+      required:
+        - error
+
+  securitySchemes:
+    bearerAuth:
+      type: http
+      scheme: bearer
+      bearerFormat: JWT
\ No newline at end of file
diff --git a/go-backend/docs/payments.yaml b/go-backend/docs/payments.yaml
new file mode 100644
index 0000000..17f0d61
--- /dev/null
+++ b/go-backend/docs/payments.yaml
@@ -0,0 +1,355 @@
+openapi: 3.0.0
+info:
+  title: 支付管理API
+  description: 支付管理相关接口文档
+  version: 1.0.0
+
+paths:
+  /api/payments:
+    get:
+      summary: 获取支付列表
+      description: 获取系统中的支付列表，支持分页（需要认证）
+      security:
+        - bearerAuth: []
+      parameters:
+        - name: skip
+          in: query
+          description: 跳过的记录数
+          required: false
+          schema:
+            type: integer
+            default: 0
+        - name: limit
+          in: query
+          description: 返回的记录数
+          required: false
+          schema:
+            type: integer
+            default: 100
+      responses:
+        '200':
+          description: 成功返回支付列表
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: '#/components/schemas/Payment'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+    post:
+      summary: 创建支付
+      description: 创建一个新的支付（需要认证）
+      security:
+        - bearerAuth: []
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/PaymentCreate'
+      responses:
+        '200':
+          description: 成功创建支付
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Payment'
+        '400':
+          description: 请求参数验证失败
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+
+  /api/payments/{id}:
+    get:
+      summary: 获取支付详情
+      description: 根据支付ID获取支付详细信息（需要认证）
+      security:
+        - bearerAuth: []
+      parameters:
+        - name: id
+          in: path
+          description: 支付ID
+          required: true
+          schema:
+            type: integer
+      responses:
+        '200':
+          description: 成功返回支付信息
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Payment'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '404':
+          description: 支付未找到
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+    put:
+      summary: 更新支付信息
+      description: 根据支付ID更新支付信息（需要认证）
+      security:
+        - bearerAuth: []
+      parameters:
+        - name: id
+          in: path
+          description: 支付ID
+          required: true
+          schema:
+            type: integer
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/PaymentUpdate'
+      responses:
+        '200':
+          description: 成功更新支付信息
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Payment'
+        '400':
+          description: 请求参数验证失败
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '404':
+          description: 支付未找到
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+    delete:
+      summary: 删除支付
+      description: 根据支付ID删除支付（需要认证）
+      security:
+        - bearerAuth: []
+      parameters:
+        - name: id
+          in: path
+          description: 支付ID
+          required: true
+          schema:
+            type: integer
+      responses:
+        '200':
+          description: 成功删除支付
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Payment'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '404':
+          description: 支付未找到
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+
+components:
+  schemas:
+    Payment:
+      type: object
+      properties:
+        id:
+          type: integer
+          description: 支付ID
+        payment_no:
+          type: string
+          description: 支付编号
+        order_id:
+          type: integer
+          description: 关联订单ID
+        amount:
+          type: number
+          format: float
+          description: 支付金额
+        payment_type:
+          type: string
+          enum: [advance, final]
+          description: 支付类型
+        payment_method:
+          type: string
+          enum: [alipay, wechat, bank]
+          description: 支付方式
+        status:
+          type: string
+          enum: [pending, paid, failed, refunded]
+          description: 支付状态
+        transaction_id:
+          type: string
+          description: 第三方交易ID
+        paid_at:
+          type: string
+          format: date-time
+          description: 支付时间
+        remark:
+          type: string
+          description: 备注
+        created_at:
+          type: string
+          format: date-time
+          description: 创建时间
+        updated_at:
+          type: string
+          format: date-time
+          description: 更新时间
+      required:
+        - id
+        - payment_no
+        - order_id
+        - amount
+        - payment_type
+        - payment_method
+        - status
+        - created_at
+        - updated_at
+
+    PaymentCreate:
+      type: object
+      properties:
+        order_id:
+          type: integer
+          description: 关联订单ID
+        amount:
+          type: number
+          format: float
+          description: 支付金额
+        payment_type:
+          type: string
+          enum: [advance, final]
+          description: 支付类型
+        payment_method:
+          type: string
+          enum: [alipay, wechat, bank]
+          description: 支付方式
+        status:
+          type: string
+          enum: [pending, paid, failed, refunded]
+          description: 支付状态
+        transaction_id:
+          type: string
+          description: 第三方交易ID
+        paid_at:
+          type: string
+          format: date-time
+          description: 支付时间
+        remark:
+          type: string
+          description: 备注
+      required:
+        - order_id
+        - amount
+        - payment_type
+        - payment_method
+
+    PaymentUpdate:
+      type: object
+      properties:
+        order_id:
+          type: integer
+          description: 关联订单ID
+        amount:
+          type: number
+          format: float
+          description: 支付金额
+        payment_type:
+          type: string
+          enum: [advance, final]
+          description: 支付类型
+        payment_method:
+          type: string
+          enum: [alipay, wechat, bank]
+          description: 支付方式
+        status:
+          type: string
+          enum: [pending, paid, failed, refunded]
+          description: 支付状态
+        transaction_id:
+          type: string
+          description: 第三方交易ID
+        paid_at:
+          type: string
+          format: date-time
+          description: 支付时间
+        remark:
+          type: string
+          description: 备注
+
+    Error:
+      type: object
+      properties:
+        error:
+          type: string
+          description: 错误信息
+      required:
+        - error
+
+  securitySchemes:
+    bearerAuth:
+      type: http
+      scheme: bearer
+      bearerFormat: JWT
\ No newline at end of file
diff --git a/go-backend/docs/users.yaml b/go-backend/docs/users.yaml
new file mode 100644
index 0000000..520620a
--- /dev/null
+++ b/go-backend/docs/users.yaml
@@ -0,0 +1,280 @@
+openapi: 3.0.0
+info:
+  title: 用户管理API
+  description: 用户管理相关接口文档
+  version: 1.0.0
+
+paths:
+  /api/login:
+    post:
+      summary: 用户登录
+      description: 用户登录并获取JWT令牌
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              type: object
+              properties:
+                username:
+                  type: string
+                  description: 用户名
+                password:
+                  type: string
+                  description: 密码
+              required:
+                - username
+                - password
+      responses:
+        '200':
+          description: 登录成功，返回访问令牌
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  access_token:
+                    type: string
+                    description: JWT访问令牌
+                  token_type:
+                    type: string
+                    description: 令牌类型
+        '400':
+          description: 请求参数错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '401':
+          description: 用户名或密码错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+
+  /api/users:
+    get:
+      summary: 获取用户列表
+      description: 获取系统中的用户列表，支持分页
+      parameters:
+        - name: skip
+          in: query
+          description: 跳过的记录数
+          required: false
+          schema:
+            type: integer
+            default: 0
+        - name: limit
+          in: query
+          description: 返回的记录数
+          required: false
+          schema:
+            type: integer
+            default: 100
+      responses:
+        '200':
+          description: 成功返回用户列表
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: '#/components/schemas/User'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+
+  /api/users/{id}:
+    get:
+      summary: 获取用户详情
+      description: 根据用户ID获取用户详细信息
+      parameters:
+        - name: id
+          in: path
+          description: 用户ID
+          required: true
+          schema:
+            type: integer
+      responses:
+        '200':
+          description: 成功返回用户信息
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/User'
+        '404':
+          description: 用户未找到
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+    put:
+      summary: 更新用户信息
+      description: 根据用户ID更新用户信息（需要认证）
+      security:
+        - bearerAuth: []
+      parameters:
+        - name: id
+          in: path
+          description: 用户ID
+          required: true
+          schema:
+            type: integer
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/UserUpdate'
+      responses:
+        '200':
+          description: 成功更新用户信息
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/User'
+        '400':
+          description: 请求参数验证失败
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '404':
+          description: 用户未找到
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+    delete:
+      summary: 删除用户
+      description: 根据用户ID删除用户（需要认证）
+      security:
+        - bearerAuth: []
+      parameters:
+        - name: id
+          in: path
+          description: 用户ID
+          required: true
+          schema:
+            type: integer
+      responses:
+        '200':
+          description: 成功删除用户
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/User'
+        '401':
+          description: 未授权
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '404':
+          description: 用户未找到
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          description: 服务器内部错误
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+
+components:
+  schemas:
+    User:
+      type: object
+      properties:
+        id:
+          type: integer
+          description: 用户ID
+        uuid:
+          type: string
+          description: 用户UUID
+        username:
+          type: string
+          description: 用户名
+        user_type:
+          type: string
+          enum: [client, supplier, driver, staff, admin]
+          description: 用户类型
+        status:
+          type: string
+          enum: [active, inactive, locked]
+          description: 用户状态
+        created_at:
+          type: string
+          format: date-time
+          description: 创建时间
+        updated_at:
+          type: string
+          format: date-time
+          description: 更新时间
+      required:
+        - id
+        - uuid
+        - username
+        - user_type
+        - status
+        - created_at
+        - updated_at
+
+    UserUpdate:
+      type: object
+      properties:
+        username:
+          type: string
+          description: 用户名
+        user_type:
+          type: string
+          enum: [client, supplier, driver, staff, admin]
+          description: 用户类型
+        status:
+          type: string
+          enum: [active, inactive, locked]
+          description: 用户状态
+
+    Error:
+      type: object
+      properties:
+        error:
+          type: string
+          description: 错误信息
+      required:
+        - error
+
+  securitySchemes:
+    bearerAuth:
+      type: http
+      scheme: bearer
+      bearerFormat: JWT
\ No newline at end of file
diff --git a/go-backend/go.mod b/go-backend/go.mod
new file mode 100644
index 0000000..a38291f
--- /dev/null
+++ b/go-backend/go.mod
@@ -0,0 +1,39 @@
+module niumall-go
+
+go 1.19
+
+require (
+    github.com/gin-gonic/gin v1.9.1
+    gorm.io/driver/mysql v1.5.1
+    gorm.io/gorm v1.25.1
+    github.com/golang-jwt/jwt/v5 v5.0.0
+    github.com/joho/godotenv v1.5.1
+    github.com/go-playground/validator/v10 v10.14.0
+    golang.org/x/crypto v0.10.0
+)
+
+require (
+    github.com/bytedance/sonic v1.9.1 // indirect
+    github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311 // indirect
+    github.com/gin-contrib/sse v0.1.0 // indirect
+    github.com/go-playground/locales v0.14.1 // indirect
+    github.com/go-playground/universal-translator v0.18.1 // indirect
+    github.com/goccy/go-json v0.10.2 // indirect
+    github.com/jinzhu/inflection v1.0.0 // indirect
+    github.com/jinzhu/now v1.1.5 // indirect
+    github.com/json-iterator/go v1.1.12 // indirect
+    github.com/klauspost/cpuid/v2 v2.2.4 // indirect
+    github.com/leodido/go-urn v1.2.4 // indirect
+    github.com/mattn/go-isatty v0.0.19 // indirect
+    github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+    github.com/modern-go/reflect2 v1.0.2 // indirect
+    github.com/pelletier/go-toml/v2 v2.0.8 // indirect
+    github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+    github.com/ugorji/go/codec v1.2.11 // indirect
+    golang.org/x/arch v0.3.0 // indirect
+    golang.org/x/net v0.10.0 // indirect
+    golang.org/x/sys v0.9.0 // indirect
+    golang.org/x/text v0.9.0 // indirect
+    google.golang.org/protobuf v1.30.0 // indirect
+    gopkg.in/yaml.v3 v3.0.1 // indirect
+)
\ No newline at end of file
diff --git a/go-backend/main.go b/go-backend/main.go
new file mode 100644
index 0000000..ca3ebfb
--- /dev/null
+++ b/go-backend/main.go
@@ -0,0 +1,45 @@
+package main
+
+import (
+	"log"
+	"os"
+
+	"github.com/gin-gonic/gin"
+	"github.com/joho/godotenv"
+
+	"niumall-go/config"
+	"niumall-go/routes"
+)
+
+func main() {
+	// Load environment variables
+	if err := godotenv.Load(); err != nil {
+		log.Println("No .env file found")
+	}
+
+	// Initialize database
+	config.InitDB()
+
+	// Set Gin to release mode in production
+	if os.Getenv("GIN_MODE") == "release" {
+		gin.SetMode(gin.ReleaseMode)
+	}
+
+	// Create Gin router
+	router := gin.Default()
+
+	// Register routes
+	routes.RegisterRoutes(router)
+
+	// Get port from environment variable or use default
+	port := os.Getenv("PORT")
+	if port == "" {
+		port = "8080"
+	}
+
+	// Start server
+	log.Printf("Server starting on port %s", port)
+	if err := router.Run(":" + port); err != nil {
+		log.Fatalf("Failed to start server: %v", err)
+	}
+}
\ No newline at end of file
diff --git a/go-backend/middleware/auth.go b/go-backend/middleware/auth.go
new file mode 100644
index 0000000..7382fd9
--- /dev/null
+++ b/go-backend/middleware/auth.go
@@ -0,0 +1,45 @@
+package middleware
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+
+	"niumall-go/utils"
+)
+
+// AuthMiddleware authenticates requests using JWT
+func AuthMiddleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		// Get authorization header
+		authHeader := c.GetHeader("Authorization")
+		if authHeader == "" {
+			c.JSON(http.StatusUnauthorized, gin.H{"error": "Authorization header required"})
+			c.Abort()
+			return
+		}
+
+		// Check if header has Bearer prefix
+		if !strings.HasPrefix(authHeader, "Bearer ") {
+			c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid authorization header format"})
+			c.Abort()
+			return
+		}
+
+		// Extract token
+		tokenString := strings.TrimPrefix(authHeader, "Bearer ")
+
+		// Parse and validate token
+		claims, err := utils.ParseJWT(tokenString)
+		if err != nil {
+			c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid or expired token"})
+			c.Abort()
+			return
+		}
+
+		// Set user UUID in context for use in handlers
+		c.Set("user_uuid", claims.UUID)
+		c.Next()
+	}
+}
\ No newline at end of file
diff --git a/go-backend/models/order.go b/go-backend/models/order.go
new file mode 100644
index 0000000..b2d3492
--- /dev/null
+++ b/go-backend/models/order.go
@@ -0,0 +1,44 @@
+package models
+
+import (
+	"time"
+
+	"gorm.io/gorm"
+)
+
+type OrderStatus string
+
+const (
+	OrderStatusPending    OrderStatus = "pending"
+	OrderStatusConfirmed  OrderStatus = "confirmed"
+	OrderStatusProcessing OrderStatus = "processing"
+	OrderStatusShipped    OrderStatus = "shipped"
+	OrderStatusDelivered  OrderStatus = "delivered"
+	OrderStatusCancelled  OrderStatus = "cancelled"
+	OrderStatusCompleted  OrderStatus = "completed"
+)
+
+type Order struct {
+	ID             uint        `gorm:"primaryKey" json:"id"`
+	OrderNo        string      `gorm:"uniqueIndex;not null" json:"order_no"`
+	BuyerID        uint        `gorm:"not null" json:"buyer_id"`
+	SellerID       uint        `gorm:"not null" json:"seller_id"`
+	VarietyType    string      `gorm:"not null" json:"variety_type"`
+	WeightRange    string      `gorm:"not null" json:"weight_range"`
+	WeightActual   float64     `json:"weight_actual"`
+	PricePerUnit   float64     `gorm:"not null" json:"price_per_unit"`
+	TotalPrice     float64     `gorm:"not null" json:"total_price"`
+	AdvancePayment float64     `gorm:"default:0.0" json:"advance_payment"`
+	FinalPayment   float64     `gorm:"default:0.0" json:"final_payment"`
+	Status         OrderStatus `gorm:"default:pending" json:"status"`
+	DeliveryAddress string     `json:"delivery_address"`
+	DeliveryTime   *time.Time  `json:"delivery_time"`
+	Remark         string      `json:"remark"`
+	CreatedAt      time.Time   `json:"created_at"`
+	UpdatedAt      time.Time   `json:"updated_at"`
+	DeletedAt      gorm.DeletedAt `gorm:"index" json:"-"`
+}
+
+func (Order) TableName() string {
+	return "orders"
+}
\ No newline at end of file
diff --git a/go-backend/models/payment.go b/go-backend/models/payment.go
new file mode 100644
index 0000000..963d34a
--- /dev/null
+++ b/go-backend/models/payment.go
@@ -0,0 +1,44 @@
+package models
+
+import (
+	"time"
+
+	"gorm.io/gorm"
+)
+
+type PaymentType string
+type PaymentMethod string
+type PaymentStatus string
+
+const (
+	PaymentTypeAdvance PaymentType = "advance"
+	PaymentTypeFinal   PaymentType = "final"
+
+	PaymentMethodWechat PaymentMethod = "wechat"
+	PaymentMethodAlipay PaymentMethod = "alipay"
+	PaymentMethodBank   PaymentMethod = "bank"
+
+	PaymentStatusPending  PaymentStatus = "pending"
+	PaymentStatusSuccess  PaymentStatus = "success"
+	PaymentStatusFailed   PaymentStatus = "failed"
+	PaymentStatusRefunded PaymentStatus = "refunded"
+)
+
+type Payment struct {
+	ID             uint           `gorm:"primaryKey" json:"id"`
+	PaymentNo      string         `gorm:"uniqueIndex;not null" json:"payment_no"`
+	OrderID        uint           `gorm:"not null" json:"order_id"`
+	UserID         uint           `gorm:"not null" json:"user_id"`
+	Amount         float64        `gorm:"not null" json:"amount"`
+	PaymentType    PaymentType    `gorm:"not null" json:"payment_type"`
+	PaymentMethod  PaymentMethod  `gorm:"not null" json:"payment_method"`
+	Status         PaymentStatus  `gorm:"default:pending" json:"status"`
+	TransactionID  string         `json:"transaction_id"`
+	CreatedAt      time.Time      `json:"created_at"`
+	UpdatedAt      time.Time      `json:"updated_at"`
+	DeletedAt      gorm.DeletedAt `gorm:"index" json:"-"`
+}
+
+func (Payment) TableName() string {
+	return "payments"
+}
\ No newline at end of file
diff --git a/go-backend/models/user.go b/go-backend/models/user.go
new file mode 100644
index 0000000..5747ca6
--- /dev/null
+++ b/go-backend/models/user.go
@@ -0,0 +1,38 @@
+package models
+
+import (
+	"time"
+
+	"gorm.io/gorm"
+)
+
+type UserType string
+type UserStatus string
+
+const (
+	UserTypeClient   UserType = "client"
+	UserTypeSupplier UserType = "supplier"
+	UserTypeDriver   UserType = "driver"
+	UserTypeStaff    UserType = "staff"
+	UserTypeAdmin    UserType = "admin"
+
+	UserStatusActive   UserStatus = "active"
+	UserStatusInactive UserStatus = "inactive"
+	UserStatusLocked   UserStatus = "locked"
+)
+
+type User struct {
+	ID        uint       `gorm:"primaryKey" json:"id"`
+	UUID      string     `gorm:"uniqueIndex;not null" json:"uuid"`
+	Username  string     `gorm:"not null" json:"username"`
+	Password  string     `gorm:"not null" json:"-"`
+	UserType  UserType   `gorm:"default:client" json:"user_type"`
+	Status    UserStatus `gorm:"default:active" json:"status"`
+	CreatedAt time.Time  `json:"created_at"`
+	UpdatedAt time.Time  `json:"updated_at"`
+	DeletedAt gorm.DeletedAt `gorm:"index" json:"-"`
+}
+
+func (User) TableName() string {
+	return "users"
+}
\ No newline at end of file
diff --git a/go-backend/routes/routes.go b/go-backend/routes/routes.go
new file mode 100644
index 0000000..d70000d
--- /dev/null
+++ b/go-backend/routes/routes.go
@@ -0,0 +1,44 @@
+package routes
+
+import (
+	"github.com/gin-gonic/gin"
+
+	"niumall-go/controllers"
+	"niumall-go/middleware"
+)
+
+func RegisterRoutes(router *gin.Engine) {
+	// Public routes
+	public := router.Group("/api")
+	{
+		// User authentication
+		public.POST("/login", controllers.Login)
+		
+		// Public user routes
+		public.GET("/users", controllers.GetUsers)
+		public.GET("/users/:id", controllers.GetUserByID)
+	}
+
+	// Protected routes
+	protected := router.Group("/api")
+	protected.Use(middleware.AuthMiddleware())
+	{
+		// User routes
+		protected.PUT("/users/:id", controllers.UpdateUser)
+		protected.DELETE("/users/:id", controllers.DeleteUser)
+
+		// Order routes
+		protected.GET("/orders", controllers.GetOrders)
+		protected.GET("/orders/:id", controllers.GetOrderByID)
+		protected.POST("/orders", controllers.CreateOrder)
+		protected.PUT("/orders/:id", controllers.UpdateOrder)
+		protected.DELETE("/orders/:id", controllers.DeleteOrder)
+
+		// Payment routes
+		protected.GET("/payments", controllers.GetPayments)
+		protected.GET("/payments/:id", controllers.GetPaymentByID)
+		protected.POST("/payments", controllers.CreatePayment)
+		protected.PUT("/payments/:id", controllers.UpdatePayment)
+		protected.DELETE("/payments/:id", controllers.DeletePayment)
+	}
+}
\ No newline at end of file
diff --git a/go-backend/utils/jwt.go b/go-backend/utils/jwt.go
new file mode 100644
index 0000000..392325e
--- /dev/null
+++ b/go-backend/utils/jwt.go
@@ -0,0 +1,62 @@
+package utils
+
+import (
+	"os"
+	"time"
+
+	"github.com/golang-jwt/jwt/v5"
+)
+
+var jwtSecret = []byte(os.Getenv("JWT_SECRET"))
+
+type Claims struct {
+	UUID string `json:"uuid"`
+	jwt.RegisteredClaims
+}
+
+// GenerateJWT generates a new JWT token for a user
+func GenerateJWT(uuid string) (string, error) {
+	// Set expiration time (24 hours from now)
+	expirationTime := time.Now().Add(24 * time.Hour)
+
+	// Create claims
+	claims := &Claims{
+		UUID: uuid,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(expirationTime),
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+		},
+	}
+
+	// Create token with claims
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+
+	// Generate encoded token
+	tokenString, err := token.SignedString(jwtSecret)
+	if err != nil {
+		return "", err
+	}
+
+	return tokenString, nil
+}
+
+// ParseJWT parses and validates a JWT token
+func ParseJWT(tokenString string) (*Claims, error) {
+	claims := &Claims{}
+
+	// Parse token
+	token, err := jwt.ParseWithClaims(tokenString, claims, func(token *jwt.Token) (interface{}, error) {
+		return jwtSecret, nil
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	// Check if token is valid
+	if !token.Valid {
+		return nil, jwt.ErrTokenMalformed
+	}
+
+	return claims, nil
+}
\ No newline at end of file
diff --git a/go-backend/utils/password.go b/go-backend/utils/password.go
new file mode 100644
index 0000000..1c2da0d
--- /dev/null
+++ b/go-backend/utils/password.go
@@ -0,0 +1,17 @@
+package utils
+
+import (
+	"golang.org/x/crypto/bcrypt"
+)
+
+// HashPassword generates a bcrypt hash of the password
+func HashPassword(password string) (string, error) {
+	bytes, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	return string(bytes), err
+}
+
+// CheckPasswordHash compares a bcrypt hashed password with its possible plaintext equivalent
+func CheckPasswordHash(password, hash string) bool {
+	err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(password))
+	return err == nil
+}
\ No newline at end of file