diff --git a/src/base/foundation/message.js b/src/base/foundation/message.js
index 4fbef7eb6..0b9b174ce 100644
--- a/src/base/foundation/message.js
+++ b/src/base/foundation/message.js
@@ -37,7 +37,7 @@ BI.Msg = function () {
                     eventName: BI.Toast.EVENT_DESTORY,
                     action: function () {
                         BI.remove(toastStack, toast.element);
-                        var _height = 10;
+                        var _height = BI.SIZE_CONSANTS.TOAST_TOP;
                         BI.each(toastStack, function (i, element) {
                             element.css({"top": _height});
                             _height += element.outerHeight() + 10;
@@ -46,7 +46,7 @@ BI.Msg = function () {
                     }
                 }]
             });
-            var height = 10;
+            var height = BI.SIZE_CONSANTS.TOAST_TOP;
             BI.each(toastStack, function (i, element) {
                 height += element.outerHeight() + 10;
             });
diff --git a/src/core/system.js b/src/core/system.js
index 54e60e8d8..3fae2a600 100644
--- a/src/core/system.js
+++ b/src/core/system.js
@@ -11,6 +11,7 @@
             TOOL_BAR_HEIGHT: 24,
             LIST_ITEM_HEIGHT: 24,
             TRIGGER_HEIGHT: 24,
+            TOAST_TOP: 10
         },
     };