diff --git a/backend/shop/views.py b/backend/shop/views.py
index 40fe18c..f965e74 100644
--- a/backend/shop/views.py
+++ b/backend/shop/views.py
@@ -24,6 +24,8 @@ import json
 import os
 import base64
 from cryptography.hazmat.primitives.ciphers.aead import AESGCM
+from cryptography.hazmat.primitives import hashes, serialization
+from cryptography.hazmat.primitives.asymmetric import padding
 from django.conf import settings
 import requests
 import random
@@ -127,6 +129,8 @@ def get_wechat_pay_client(pay_type=WeChatPayType.NATIVE, appid=None, config=None
             notify_url=notify_url,
             cert_dir=cert_dir
         )
+        # 保存私钥内容以便后续手动签名使用
+        wxpay._private_key_content = private_key
         return wxpay, None
     except Exception as e:
         return None, str(e)
@@ -769,12 +773,26 @@ class OrderViewSet(viewsets.ModelViewSet):
                 # 签名串格式：appId\ntimeStamp\nnonceStr\npackage\n
                 message_build = f"{miniprogram_appid}\n{timestamp}\n{nonce_str}\n{package}\n"
                 
-                # 使用商户私钥签名
-                # 注意：WeChatPayV3 对象的私钥属性名可能随版本变化，或者被封装
-                # 这里我们不直接访问私钥，而是利用 SDK 提供的 sign 方法
+                print(f"待签名字符串:\n{repr(message_build)}")
                 
-                # 实际上 wechatpayv3 库提供了 sign 方法
-                signature = wxpay.sign(message_build)
+                # 手动签名
+                from cryptography.hazmat.backends import default_backend
+                
+                private_key_obj = serialization.load_pem_private_key(
+                    wxpay._private_key_content.encode('utf-8'),
+                    password=None,
+                    backend=default_backend()
+                )
+                
+                signature = base64.b64encode(
+                    private_key_obj.sign(
+                        message_build.encode('utf-8'),
+                        padding.PKCS1v15(),
+                        hashes.SHA256()
+                    )
+                ).decode('utf-8')
+                
+                print(f"生成的签名: {signature}")
 
                 return Response({
                     'timeStamp': timestamp,