diff --git a/src/base/combination/combo.js b/src/base/combination/combo.js
index f73fec11d..003571b29 100644
--- a/src/base/combination/combo.js
+++ b/src/base/combination/combo.js
@@ -196,28 +196,22 @@
             this.popupView.visible();
             var combo = (o.belowMouse && BI.isNotNull(e)) ? {
                 element: {
-                    0: e.target,
+                    0: BI.extend({}, e.target, {
+                        getBoundingClientRect: function () {
+                            return {
+                                left: e.pageX,
+                                top: e.pageY,
+                                width: 0,
+                                height: 0,
+                            };
+                        }
+                    }),
                     offset: function () {
                         return {
                             left: e.pageX,
                             top: e.pageY,
                         };
                     },
-                    bounds: function () {
-                        // offset为其相对于父定位元素的偏移
-                        return {
-                            x: e.offsetX,
-                            y: e.offsetY,
-                            width: 0,
-                            height: 24,
-                        };
-                    },
-                    outerWidth: function () {
-                        return 0;
-                    },
-                    outerHeight: function () {
-                        return 24;
-                    },
                 },
             } : this.combo;
             var positionRelativeElement = BI.DOM.getPositionRelativeContainingBlock(BI.isNull(o.container) ? this.element[0] : BI.Widget._renderEngine.createElement(BI.isFunction(o.container) ? o.container() : o.container)[0]);
diff --git a/src/core/platform/web/dom.js b/src/core/platform/web/dom.js
index d2fffd753..9b1026683 100644
--- a/src/core/platform/web/dom.js
+++ b/src/core/platform/web/dom.js
@@ -249,12 +249,14 @@
         },
 
         _getLeftAlignPosition: function (combo, popup, extraWidth, container) {
-            var viewBounds = popup.element.bounds(),
-                windowBounds = BI.Widget._renderEngine.createElement("body").bounds();
-            var left = combo.element.offset().left - (container ? container.getBoundingClientRect().left : 0) + extraWidth;
+            var comboRect = combo.element[0].getBoundingClientRect(),
+                popupRect = popup.element.bounds(),
+                viewportRect = document.documentElement.getBoundingClientRect(),
+                containerRect = container ? container.getBoundingClientRect() : { left: 0 };
+            var left = comboRect.left - containerRect.left + extraWidth;
 
-            if (left + viewBounds.width > windowBounds.width) {
-                left = windowBounds.width - viewBounds.width;
+            if (left + popupRect.width - containerRect.left > viewportRect.width) {
+                left = viewportRect.width - popupRect.width - containerRect.left;
             }
             return left;
         },
@@ -285,17 +287,19 @@
             };
         },
 
-        _getRightAlignPosition: function (combo, popup, extraWidth) {
-            var comboBounds = combo.element.bounds(), viewBounds = popup.element.bounds();
-            return combo.element.offset().left + comboBounds.width - viewBounds.width - extraWidth;
+        _getRightAlignPosition: function (combo, popup, extraWidth, container) {
+            var comboBounds = combo.element[0].getBoundingClientRect(),
+                viewBounds = popup.element[0].getBoundingClientRect(),
+                containerRect = container ? container.getBoundingClientRect() : { left: 0 };
+            return comboBounds.left + comboBounds.width - viewBounds.width - extraWidth - containerRect.left;
         },
 
-        getRightAlignPosition: function (combo, popup, extraWidth) {
-            var left = this._getRightAlignPosition(combo, popup, extraWidth);
+        getRightAlignPosition: function (combo, popup, extraWidth, container) {
+            var left = this._getRightAlignPosition(combo, popup, extraWidth, container);
             var dir = "";
             // 如果放不下，优先使用LeftAlign, 如果LeftAlign也放不下, 再使用left=0
             if (left < 0) {
-                left = this._getLeftAlignPosition(combo, popup, extraWidth);
+                left = this._getLeftAlignPosition(combo, popup, extraWidth, container);
                 dir = "right";
             }
             if (left < 0) {
@@ -317,14 +321,13 @@
         },
 
         getTopAlignPosition: function (combo, popup, extraHeight, needAdaptHeight, container) {
-            var comboOffset = combo.element.offset();
             var comboBounds = combo.element[0].getBoundingClientRect(),
                 popupBounds = popup.element[0].getBoundingClientRect(),
                 viewportBounds = document.documentElement.getBoundingClientRect(),
                 containerBounds = container ? container.getBoundingClientRect() : { top: 0 };
             var top, adaptHeight, dir;
             if (BI.DOM.isBottomSpaceEnough(combo, popup, -1 * comboBounds.height + extraHeight)) {
-                top = comboOffset.top - containerBounds.top + extraHeight;
+                top = comboBounds.top - containerBounds.top + extraHeight;
             } else if (needAdaptHeight) {
                 top = comboBounds.top - containerBounds.top + extraHeight;
                 adaptHeight = viewportBounds.height - comboBounds.top;
@@ -375,20 +378,19 @@
         },
 
         getBottomAlignPosition: function (combo, popup, extraHeight, needAdaptHeight, container) {
-            var comboOffset = combo.element.offset();
             var comboBounds = combo.element[0].getBoundingClientRect(),
                 popupBounds = popup.element[0].getBoundingClientRect(),
                 windowBounds = BI.Widget._renderEngine.createElement("body").bounds(),
                 containerBounds = container ? container.getBoundingClientRect() : { top: 0 };
             var top, adaptHeight, dir;
             if (BI.DOM.isTopSpaceEnough(combo, popup, -1 * comboBounds.height + extraHeight)) {
-                top = comboOffset.top + comboBounds.height - containerBounds.top - popupBounds.height;
+                top = comboBounds.top + comboBounds.height - containerBounds.top - popupBounds.height;
             } else if (needAdaptHeight) {
                 top = 0 - containerBounds.top;
                 adaptHeight = comboBounds.top + comboBounds.height - extraHeight;
             } else if (BI.DOM.isBottomSpaceEnough(combo, popup, -1 * comboBounds.height + extraHeight)) {
                 // 上方空间不足且不允许调整高度的情况下，优先使用下对齐
-                top = comboOffset.top - containerBounds.top + extraHeight;
+                top = comboBounds.top - containerBounds.top + extraHeight;
                 dir = "bottom";
             } else {
                 top = 0;
@@ -410,7 +412,6 @@
         },
 
         getBottomAdaptPosition: function (combo, popup, extraHeight, needAdaptHeight) {
-            var comboOffset = combo.element.offset();
             var comboBounds = combo.element.bounds(), popupBounds = popup.element.bounds(),
                 windowBounds = BI.Widget._renderEngine.createElement("body").bounds();
             if (BI.DOM.isBottomSpaceEnough(combo, popup, extraHeight)) {
@@ -418,8 +419,8 @@
             }
             if (needAdaptHeight) {
                 return {
-                    top: comboOffset.top + comboBounds.height + extraHeight,
-                    adaptHeight: windowBounds.height - comboOffset.top - comboBounds.height - extraHeight
+                    top: comboBounds.top + comboBounds.height + extraHeight,
+                    adaptHeight: windowBounds.height - comboBounds.top - comboBounds.height - extraHeight
                 };
             }
             if (popupBounds.height + extraHeight > windowBounds.height) {