diff --git a/packages/fineui/src/core/utils/dom.js b/packages/fineui/src/core/utils/dom.js
index 65b746600..a917a4de6 100644
--- a/packages/fineui/src/core/utils/dom.js
+++ b/packages/fineui/src/core/utils/dom.js
@@ -2,7 +2,7 @@
  * 对DOM操作的通用函数
  */
 import $ from "jquery";
-import { each, isEmpty, isNotEmptyObject, isNull } from "../2.base";
+import { each, isEmpty, isNotEmptyObject } from "../2.base";
 import { Widget } from "../4.widget";
 import { isIE } from "./../platform";
 
@@ -116,7 +116,7 @@ export function getScrollWidth(css) {
 
     if (hasNoneScrollWidth) {
         return 0;
-    } else if (isNull(_scrollWidthMap[key])) {
+    } else if (!_scrollWidthMap[key]) {
         const ul = Widget._renderEngine
             .createElement("<div>")
             .width(50)