diff --git a/platform/jdapi/jdapi.go b/platform/jdapi/jdapi.go
index 820f8807..83d67c2f 100644
--- a/platform/jdapi/jdapi.go
+++ b/platform/jdapi/jdapi.go
@@ -152,7 +152,7 @@ func (j *JDAPI) AccessJDQuery(apiStr string, jdParams map[string]string) (retVal
 		j.sugarLogger.Errorf("Error when marshal %v, error:%v", jdParams, err)
 		return nil, err
 	}
-	params["jd_param_json"] = jdParamStr
+	params["jd_param_json"] = string(jdParamStr)
 	params["timestamp"] = utils.GetCurTimeStr()
 	sign := signParams(params)
 	params["sign"] = sign