diff --git a/src/base/combination/combo.js b/src/base/combination/combo.js
index 879313495..c937f8f84 100644
--- a/src/base/combination/combo.js
+++ b/src/base/combination/combo.js
@@ -162,7 +162,7 @@
             this._assertPopupViewRender();
             this.fireEvent(BI.Combo.EVENT_BEFORE_POPUPVIEW);
             // popupVisible是为了获取其宽高, 放到可视范围之外以防止在IE下闪一下
-            this.popupView.css({ left: -999999999, top: -99999999 });
+            this.popupView.css({ left: -99999, top: -99999 });
             this.popupView.visible();
             BI.each(needHideWhenAnotherComboOpen, function (i, combo) {
                 if (i !== self.getName()) {