diff --git a/intc-modules/intc-weixin/src/main/java/com/intc/weixin/controller/WeixinController.java b/intc-modules/intc-weixin/src/main/java/com/intc/weixin/controller/WeixinController.java
index 1207f75..66d3360 100644
--- a/intc-modules/intc-weixin/src/main/java/com/intc/weixin/controller/WeixinController.java
+++ b/intc-modules/intc-weixin/src/main/java/com/intc/weixin/controller/WeixinController.java
@@ -244,6 +244,12 @@ public class WeixinController extends BaseController {
                 return R.fail("创建微信预支付订单失败");
             }
 
+            // 7.1 更新订单的prepayId
+            boolean updated = payOrderBusinessService.updatePrepayId(orderId, prepayId);
+            if (!updated) {
+                log.warn("更新订单prepayId失败: orderId={}, prepayId={}", orderId, prepayId);
+            }
+
             // 8. 生成JSAPI支付参数
             String appId = wxMaProperties != null && wxMaProperties.getAppId() != null ?
                 wxMaProperties.getAppId() : "";
diff --git a/intc-modules/intc-weixin/src/main/java/com/intc/weixin/service/PayOrderBusinessService.java b/intc-modules/intc-weixin/src/main/java/com/intc/weixin/service/PayOrderBusinessService.java
index 82a855e..78a2fbc 100644
--- a/intc-modules/intc-weixin/src/main/java/com/intc/weixin/service/PayOrderBusinessService.java
+++ b/intc-modules/intc-weixin/src/main/java/com/intc/weixin/service/PayOrderBusinessService.java
@@ -73,4 +73,13 @@ public interface PayOrderBusinessService {
      * @return 设备充值记录列表
      */
     List<PayDevice> queryPayDevicesByOrderId(Long orderId);
+
+    /**
+     * 更新订单的预支付交易会话标识
+     *
+     * @param orderId 订单ID
+     * @param prepayId 预支付交易会话标识
+     * @return 是否更新成功
+     */
+    boolean updatePrepayId(Long orderId, String prepayId);
 }
diff --git a/intc-modules/intc-weixin/src/main/java/com/intc/weixin/service/impl/PayOrderBusinessServiceImpl.java b/intc-modules/intc-weixin/src/main/java/com/intc/weixin/service/impl/PayOrderBusinessServiceImpl.java
index 6fe23b1..29806b3 100644
--- a/intc-modules/intc-weixin/src/main/java/com/intc/weixin/service/impl/PayOrderBusinessServiceImpl.java
+++ b/intc-modules/intc-weixin/src/main/java/com/intc/weixin/service/impl/PayOrderBusinessServiceImpl.java
@@ -93,6 +93,7 @@ public class PayOrderBusinessServiceImpl implements PayOrderBusinessService {
         order.setTradeType("JSAPI");
         order.setAttachment(String.valueOf(payId)); // 设置支付选项ID
         order.setNotifyUrl(notifyUrl); // 设置支付回调通知URL
+        order.setPrepayId(""); // 初始化为空字符串，待微信支付API调用后更新
 
         payOrderMapper.insert(order);
 
@@ -241,6 +242,21 @@ public class PayOrderBusinessServiceImpl implements PayOrderBusinessService {
         );
     }
 
+    @Override
+    public boolean updatePrepayId(Long orderId, String prepayId) {
+        if (orderId == null || prepayId == null || prepayId.isEmpty()) {
+            return false;
+        }
+
+        int rows = payOrderMapper.update(null,
+            new LambdaUpdateWrapper<PayOrder>()
+                .eq(PayOrder::getId, orderId)
+                .set(PayOrder::getPrepayId, prepayId)
+        );
+
+        return rows > 0;
+    }
+
     /**
      * 计算新的到期时间
      *