diff --git a/vnpy/gateway/ctp/ctp_gateway.py b/vnpy/gateway/ctp/ctp_gateway.py
index 9e48de58..d9c1980f 100644
--- a/vnpy/gateway/ctp/ctp_gateway.py
+++ b/vnpy/gateway/ctp/ctp_gateway.py
@@ -680,7 +680,7 @@ class CtpTdApi(TdApi):
             "UserID": self.userid,
             "Password": self.password,
             "BrokerID": self.brokerid,
-            "UserProductInfo": self.appid
+            "AppID": self.appid
         }
         
         self.reqid += 1