diff --git a/dist/utils.js b/dist/utils.js
index 131adbefe..42ec5f109 100644
--- a/dist/utils.js
+++ b/dist/utils.js
@@ -12362,6 +12362,7 @@ if (!_global.BI) {
         _purgeRef: function () {
             if (this.options.ref) {
                 this.options.ref.call(null);
+                this.options.ref = null;
             }
         },
 
diff --git a/src/base/combination/combo.js b/src/base/combination/combo.js
index 0a963ce8c..64ec1385a 100644
--- a/src/base/combination/combo.js
+++ b/src/base/combination/combo.js
@@ -518,6 +518,7 @@ BI.Combo = BI.inherit(BI.Widget, {
             .unbind("mousemove." + this.getName())
             .unbind("mouseleave." + this.getName());
         BI.Resizers.remove(this.getName());
+        this.popupView && this.popupView._destroy();
     }
 });
 BI.Combo.EVENT_TRIGGER_CHANGE = "EVENT_TRIGGER_CHANGE";
diff --git a/src/base/combination/switcher.js b/src/base/combination/switcher.js
index d6c1f1300..e3a73bcda 100644
--- a/src/base/combination/switcher.js
+++ b/src/base/combination/switcher.js
@@ -271,10 +271,6 @@ BI.Switcher = BI.inherit(BI.Widget, {
 
     empty: function () {
         this.popupView && this.popupView.empty();
-    },
-
-    destroy: function () {
-        BI.Switcher.superclass.destroy.apply(this, arguments);
     }
 });
 BI.Switcher.EVENT_EXPAND = "EVENT_EXPAND";
diff --git a/src/core/ob.js b/src/core/ob.js
index 4cf532c5a..7bafa8a1e 100644
--- a/src/core/ob.js
+++ b/src/core/ob.js
@@ -81,6 +81,7 @@
         _purgeRef: function () {
             if (this.options.ref) {
                 this.options.ref.call(null);
+                this.options.ref = null;
             }
         },
 
diff --git a/src/core/widget.js b/src/core/widget.js
index 09dfd5573..e5dbbe0fc 100644
--- a/src/core/widget.js
+++ b/src/core/widget.js
@@ -445,6 +445,7 @@
 
         __d: function () {
             this.beforeDestroy && this.beforeDestroy();
+            this.beforeDestroy = null;
             BI.each(this._children, function (i, widget) {
                 widget && widget._unMount && widget._unMount();
             });
@@ -452,6 +453,7 @@
             this._parent = null;
             this._isMounted = false;
             this.destroyed && this.destroyed();
+            this.destroyed = null;
         },
 
         _unMount: function () {