diff --git a/ChangeLog b/ChangeLog
index 045202ca..774240c5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -110,6 +110,8 @@ getJSONfromFileTable.
 
 * feature(dom) add events.add array
 
+* feauture(client) add unload event
+
 
 2012.04.22, v0.2.0
 
diff --git a/lib/client.js b/lib/client.js
index 93f622fa..9e2d7fe5 100644
--- a/lib/client.js
+++ b/lib/client.js
@@ -151,6 +151,17 @@ var Util, DOM, CloudFunc, CloudCmd;
             };
         
         Util.ifExec(document.body.scrollIntoViewIfNeeded, lCallBack, lFunc);
+        
+        DOM.Events.add(['unload', 'beforeunload'], function (pEvent) {
+                var lRet, lIsBind = Key.isBind();
+                
+                if(!lIsBind) {
+                    DOM.preventDefault(pEvent);
+                    lRet = 'Please make sure that you saved all work.';
+                }
+                
+                return lRet;
+            });
     };
     
     function initModules(pCallBack){