diff --git a/platformapi/ebaiapi/callback.go b/platformapi/ebaiapi/callback.go
index 6101b1ca..bc03351b 100644
--- a/platformapi/ebaiapi/callback.go
+++ b/platformapi/ebaiapi/callback.go
@@ -90,7 +90,7 @@ func (a *API) CheckCallbackValidation(request *http.Request) (callbackResponse *
 	if sign != request.FormValue(signKey) {
 		msg := fmt.Sprintf("Signature is not ok, mine:%v, get:%v", sign, request.FormValue(signKey))
 		baseapi.SugarLogger.Info(msg)
-		return a.Err2CallbackResponse(request.FormValue("cmd"), errors.New(msg), nil)
+		return a.Err2CallbackResponse(GetCmd(request), errors.New(msg), nil)
 	}
 	return nil
 }
@@ -102,12 +102,16 @@ func (a *API) GetCallbackMsg(request *http.Request) (msg *CallbackMsg, callbackR
 			return nil, callbackResponse
 		}
 		msg = new(CallbackMsg)
-		if callbackResponse = a.unmarshalData(request.FormValue("cmd"), []byte(request.FormValue("body")), &msg.Body); callbackResponse != nil {
+		if callbackResponse = a.unmarshalData(GetCmd(request), []byte(request.FormValue("body")), &msg.Body); callbackResponse != nil {
 			return nil, callbackResponse
 		}
-		msg.Cmd = request.FormValue("cmd")
+		msg.Cmd = GetCmd(request)
 		msg.Timestamp = utils.Str2Int64(utils.Interface2String(request.FormValue("timestamp")))
 		return msg, nil
 	}
 	return nil, a.Err2CallbackResponse("", err, nil)
 }
+
+func GetCmd(request *http.Request) string {
+	return request.FormValue("cmd")
+}