diff --git a/src/core/2.base.js b/src/core/2.base.js
index 4ab530629..7071eb3e1 100644
--- a/src/core/2.base.js
+++ b/src/core/2.base.js
@@ -524,6 +524,10 @@
 
         isWindow: function (obj) {
             return obj != null && obj == obj.window;
+        },
+
+        isPromise: function(obj) {
+            return !!obj && (BI.isObject(obj) || BI.isFunction(obj)) && BI.isFunction(obj.then);
         }
     });
 
diff --git a/typescript/core/base.ts b/typescript/core/base.ts
index a30828489..1d6022a1c 100644
--- a/typescript/core/base.ts
+++ b/typescript/core/base.ts
@@ -376,6 +376,12 @@ export interface _base {
     getDate: (...args: (number | string)[]) => Date;
 
     getTime: (...args: any[]) => number;
+
+    /**
+     * 判断一个对象是不是promise
+     * @param obj 对象
+     */
+    isPromise: (obj: any) => obj is Promise<any>;
 }
 
 type merge = {