diff --git a/lib/Common/common.js b/lib/Common/common.js
index ae9873b8..81ce8076 100644
--- a/lib/Common/common.js
+++ b/lib/Common/common.js
@@ -327,6 +327,14 @@ global.parse_name = function(name, type){
         }).toLowerCase();
     }
 }
+/**
+ * 判断是否是个promise
+ * @param  {[type]}  obj [description]
+ * @return {Boolean}     [description]
+ */
+global.is_promise = function(obj){
+    return when.isPromise(obj);
+}
 /**
  * 生成一个promise,如果传入的参数是promise则直接返回
  * @param  {[type]} obj [description]