diff --git a/extension/bmap/BMapCoordSys.js b/extension/bmap/BMapCoordSys.js
index bd0c460e80..eda669ce69 100644
--- a/extension/bmap/BMapCoordSys.js
+++ b/extension/bmap/BMapCoordSys.js
@@ -133,7 +133,8 @@ define(function (require) {
 
         // TODO Dispose
         ecModel.eachComponent('bmap', function (bmapModel) {
-            var viewportRoot = api.getZr().painter.getViewportRoot();
+            var painter = api.getZr().painter;
+            var viewportRoot = painter.getViewportRoot();
             if (typeof BMap === 'undefined') {
                 throw new Error('BMap api is not loaded');
             }
@@ -160,6 +161,11 @@ define(function (require) {
 
                 var overlay = new Overlay(viewportRoot);
                 bmap.addOverlay(overlay);
+
+                // Override
+                painter.getViewportRootOffset = function () {
+                    return {offsetLeft: 0, offsetTop: 0};
+                };
             }
             var bmap = bmapModel.__bmap;
 
diff --git a/src/component/tooltip/TooltipContent.js b/src/component/tooltip/TooltipContent.js
index ee53b8aa0e..f054ae92fe 100644
--- a/src/component/tooltip/TooltipContent.js
+++ b/src/component/tooltip/TooltipContent.js
@@ -219,10 +219,10 @@ define(function (require) {
             // the sibling of canvas root. So padding of ec container
             // should be considered here.
             var zr = this._zr;
-            var viewportRoot;
-            if (zr && zr.painter && (viewportRoot = zr.painter.getViewportRoot())) {
-                x += viewportRoot.offsetLeft || 0;
-                y += viewportRoot.offsetTop || 0;
+            var viewportRootOffset;
+            if (zr && zr.painter && (viewportRootOffset = zr.painter.getViewportRootOffset())) {
+                x += viewportRootOffset.offsetLeft;
+                y += viewportRootOffset.offsetTop;
             }
 
             var style = this.el.style;