diff --git a/pages/buyer/index.js b/pages/buyer/index.js
index 37d4270..2be6d92 100644
--- a/pages/buyer/index.js
+++ b/pages/buyer/index.js
@@ -132,6 +132,9 @@ Page({
       return;
     }
 
+    // 更新用户类型为买家
+    API.updateUserType('buyer');
+
     // 1. 前置验证
     if (!goodsId) {
       console.error('商品ID为空，无法预约');
diff --git a/pages/seller/index.js b/pages/seller/index.js
index 32272fb..50e9b2b 100644
--- a/pages/seller/index.js
+++ b/pages/seller/index.js
@@ -1226,6 +1226,10 @@ Page({
       e.stopPropagation();
     }
     
+    // 更新用户类型为卖家
+    const API = require('../../utils/api.js');
+    API.updateUserType('seller');
+    
     // 从本地存储加载之前保存的货源数据
     const savedSupply = wx.getStorageSync('newSupplyDraft') || { name: '', price: '', minOrder: '', yolk: '', spec: '', imageUrls: [] };
     
diff --git a/utils/api.js b/utils/api.js
index b75649c..0625985 100644
--- a/utils/api.js
+++ b/utils/api.js
@@ -2049,6 +2049,75 @@ module.exports = {
       });
     });
   },
-  
+
+  // 更新用户类型
+  updateUserType: async (typeToAdd) => {
+    try {
+      const userId = wx.getStorageSync('userId');
+      const openid = wx.getStorageSync('openid');
+      const userInfo = wx.getStorageSync('userInfo');
+      
+      if (!userId || !openid) {
+        console.log('用户未登录，无法更新用户类型');
+        return;
+      }
+      
+      // 获取当前用户类型
+      let users = wx.getStorageSync('users') || {};
+      let currentType = users[userId] && users[userId].type ? users[userId].type : '';
+      
+      // 计算新的用户类型
+      let newType = currentType;
+      
+      if (typeToAdd === 'buyer') {
+        if (currentType === 'seller') {
+          newType = 'both';
+        } else {
+          newType = 'buyer';
+        }
+      } else if (typeToAdd === 'seller') {
+        if (currentType === 'buyer') {
+          newType = 'both';
+        } else {
+          newType = 'seller';
+        }
+      }
+      
+      // 如果类型没有变化，不需要更新
+      if (newType === currentType) {
+        return;
+      }
+      
+      // 更新本地存储
+      if (!users[userId]) {
+        users[userId] = {};
+      }
+      users[userId].type = newType;
+      wx.setStorageSync('users', users);
+      
+      // 更新全局数据
+      const app = getApp();
+      app.globalData.userType = newType;
+      
+      // 上传到服务器
+      const uploadData = {
+        userId,
+        openid,
+        ...userInfo,
+        type: newType,
+        timestamp: Date.now()
+      };
+      
+      return API.request({
+        url: '/api/user/update',
+        method: 'POST',
+        data: uploadData
+      });
+      
+    } catch (error) {
+      console.error('更新用户类型失败:', error);
+      throw error;
+    }
+  },
 
 };
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