diff --git a/video-gen-api/app/services/payment.py b/video-gen-api/app/services/payment.py
index 6aac28aa..fd7fa51d 100644
--- a/video-gen-api/app/services/payment.py
+++ b/video-gen-api/app/services/payment.py
@@ -376,16 +376,14 @@ def _get_wechat_client(
         return None
 
     try:
-        # 处理私钥格式，确保是正确的 PEM 格式
-        private_key_str = private_key.strip()
-        if not private_key_str.startswith("-----BEGIN"):
-            private_key_str = "-----BEGIN PRIVATE KEY-----\n" + private_key_str + "\n-----END PRIVATE KEY-----"
+        # 直接传入原始私钥，让 SDK 自己处理格式化
+        # SDK 内部已有 format_private_key 函数处理各种格式
         
         # 初始化微信支付客户端
         _wechat_client = WeChatPay(
             wechatpay_type=WeChatPayType.NATIVE,
             mchid=mch_id,
-            private_key=private_key_str,
+            private_key=private_key.strip(),
             cert_serial_no=cert_serial_no,
             appid=appid,
             apiv3_key=api_v3_key,