diff --git a/src/image/image.ts b/src/image/image.ts
index f36b7b38a..a4b8b0639 100644
--- a/src/image/image.ts
+++ b/src/image/image.ts
@@ -24,7 +24,7 @@ export default class Image extends SuperComponent {
     classPrefix: name,
   };
 
-  preSrc = ''; // 保留上一次的src,防止在src相同时重复update
+  preSrc = undefined; // 保留上一次的src,防止在src相同时重复update
 
   observers = {
     src() {