diff --git a/db/update15.3.sql b/db/update15.3.sql
index 743ccea4e4..0a42b47c5a 100644
--- a/db/update15.3.sql
+++ b/db/update15.3.sql
@@ -1 +1,2 @@
 ALTER TABLE `zt_testtask` ADD `realFinishedDate` datetime NOT NULL AFTER `end`;
+ALTER TABLE `zt_doc` ADD `tempContent` longtext NOT NULL AFTER `views`;
diff --git a/db/zentao.sql b/db/zentao.sql
index ab4f9f3beb..454543e96c 100644
--- a/db/zentao.sql
+++ b/db/zentao.sql
@@ -310,6 +310,7 @@ CREATE TABLE IF NOT EXISTS `zt_doc` (
   `keywords` varchar(255) NOT NULL,
   `type` varchar(30) NOT NULL,
   `views` smallint(5) unsigned NOT NULL,
+  `tempContent` longtext NOT NULL,
   `collector` text NOT NULL,
   `addedBy` varchar(30) NOT NULL,
   `addedDate` datetime NOT NULL,
diff --git a/module/doc/control.php b/module/doc/control.php
index 35f930da6f..6556eec2c2 100644
--- a/module/doc/control.php
+++ b/module/doc/control.php
@@ -752,6 +752,18 @@ class doc extends control
         die($select);
     }
 
+    /**
+     * Ajax save temporary content of doc.
+     *
+     * @param  int    $docID
+     * @access public
+     * @return void
+     */
+    public function ajaxSaveContent($docID)
+    {
+        $this->doc->saveTempContent($docID);
+    }
+
     /**
      * Show files.
      *
diff --git a/module/doc/js/edit.js b/module/doc/js/edit.js
index 15d946b179..2a1069e2b5 100644
--- a/module/doc/js/edit.js
+++ b/module/doc/js/edit.js
@@ -1,5 +1,15 @@
 $(function()
 {
+    if(needUpdateContent)
+    {
+        if(confirm(confirmUpdateContent))
+        {
+            $('#content').html(tempContent);
+            editor = KindEditor.instances[0];
+            editor.html(tempContent);
+        }
+    }
+
     $('#top-submit').click(function()
     {
         $(this).addClass('disabled');
@@ -23,42 +33,64 @@ $(function()
 
     $('#subNavbar li[data-id="doc"]').addClass('active');
 
+    /* Automatically save document contents. */
+    setInterval("saveTempContent()", 60 * 1000);
+
     $(document).on("mousedown", 'span[data-name="fullscreen"]', function()
     {
-        if($(this).hasClass('ke-selected'))
+        if(config.onlybody == 'no')
         {
-            $('#submit').removeClass('fullscreen-save')
-            $('#submit').addClass('btn-wide')
-        }
-        else
-        {
-            $('#submit').addClass('fullscreen-save')
-            $('#submit').removeClass('btn-wide')
+            if($(this).hasClass('ke-selected'))
+            {
+                $('#submit').removeClass('fullscreen-save')
+                $('#submit').addClass('btn-wide')
+            }
+            else
+            {
+                $('#submit').addClass('fullscreen-save')
+                $('#submit').removeClass('btn-wide')
+            }
         }
     });
 
     $(document).on("mousedown", 'a[title="Fullscreen"],.icon-columns', function()
     {
-        setTimeout(function()
+        if(config.onlybody == 'no')
         {
-            if($('a[title="Fullscreen"]').hasClass('active'))
+            setTimeout(function()
             {
-                $('#submit').addClass('markdown-fullscreen-save')
-                $('#submit').removeClass('btn-wide')
-                $('.fullscreen').css('height', '50px');
-                $('.fullscreen').css('padding-top', '15px');
-                $('.CodeMirror-fullscreen').css('top', '50px');
-                $('.editor-preview-side').css('top', '50px');
-            }
-            else
-            {
-                $('#submit').removeClass('markdown-fullscreen-save')
-                $('#submit').addClass('btn-wide')
-                $('.editor-toolbar').css('height', '30px');
-                $('.editor-toolbar').css('padding-top', '1px');
-                $('.CodeMirror').css('top', '0');
-                $('.editor-preview-side').css('top', '30px');
-            }
-        }, 200);
+                if($('a[title="Fullscreen"]').hasClass('active'))
+                {
+                    $('#submit').addClass('markdown-fullscreen-save')
+                    $('#submit').removeClass('btn-wide')
+                    $('.fullscreen').css('height', '50px');
+                    $('.fullscreen').css('padding-top', '15px');
+                    $('.CodeMirror-fullscreen').css('top', '50px');
+                    $('.editor-preview-side').css('top', '50px');
+                }
+                else
+                {
+                    $('#submit').removeClass('markdown-fullscreen-save')
+                    $('#submit').addClass('btn-wide')
+                    $('.editor-toolbar').css('height', '30px');
+                    $('.editor-toolbar').css('padding-top', '1px');
+                    $('.CodeMirror').css('top', '0');
+                    $('.editor-preview-side').css('top', '30px');
+                }
+            }, 200);
+        }
     });
 })
+
+/**
+ * Save temporary doc content.
+ *
+ * @access public
+ * @return void
+ */
+function saveTempContent()
+{
+    var content = $('#content').val();
+    var link    = createLink('doc', 'ajaxSaveContent', 'docID=' + docID);
+    $.post(link, {content: content});
+}
diff --git a/module/doc/lang/de.php b/module/doc/lang/de.php
index 25cd16baa5..3cfb95756c 100644
--- a/module/doc/lang/de.php
+++ b/module/doc/lang/de.php
@@ -189,6 +189,7 @@ $lang->doc->noEditedDoc          = 'Sie haben kein Dokument bearbeitet.';
 $lang->doc->noOpenedDoc          = 'Sie haben kein Dokument erstellt.';
 $lang->doc->noCollectedDoc       = 'Sie haben kein Dokument gesammelt.';
 $lang->doc->errorEmptyLib        = 'No data in document library.';
+$lang->doc->confirmUpdateContent = 'You have a document that is not saved from last time. Do you want to continue editing it?';
 
 $lang->doc->noticeAcl['lib']['product']['default']   = 'Users who can access the selected product can access it.';
 $lang->doc->noticeAcl['lib']['product']['custom']    = 'Users who can access the selected product or users in the whiltelist can access it.';
diff --git a/module/doc/lang/en.php b/module/doc/lang/en.php
index 95b90e6c8e..f3bc4adaf6 100644
--- a/module/doc/lang/en.php
+++ b/module/doc/lang/en.php
@@ -194,6 +194,7 @@ $lang->doc->noEditedDoc          = 'You have not edited any documents.';
 $lang->doc->noOpenedDoc          = 'You have not created any documents.';
 $lang->doc->noCollectedDoc       = 'You have not favorited any documents.';
 $lang->doc->errorEmptyLib        = 'No data in document library.';
+$lang->doc->confirmUpdateContent = 'You have a document that is not saved from last time. Do you want to continue editing it?';
 
 $lang->doc->noticeAcl['lib']['product']['default']   = 'Users who can access the selected product can access it.';
 $lang->doc->noticeAcl['lib']['product']['custom']    = 'Users who can access the selected product or users in the whiltelist can access it.';
diff --git a/module/doc/lang/fr.php b/module/doc/lang/fr.php
index b13b96b2c3..90a77b2b57 100644
--- a/module/doc/lang/fr.php
+++ b/module/doc/lang/fr.php
@@ -189,6 +189,7 @@ $lang->doc->noEditedDoc          = "Vous n'avez pas mis à jour de documents.";
 $lang->doc->noOpenedDoc          = "Vous n'avez pas ajouté de documents.";
 $lang->doc->noCollectedDoc       = "Vous avez aucun document dans vos favoris.";
 $lang->doc->errorEmptyLib        = 'No data in document library.';
+$lang->doc->confirmUpdateContent = 'You have a document that is not saved from last time. Do you want to continue editing it?';
 
 $lang->doc->noticeAcl['lib']['product']['default']   = 'Les utilisateurs qui ont accès au Product peuvent y accéder.';
 $lang->doc->noticeAcl['lib']['product']['custom']    = 'Les utilisateurs qui ont accès au Product ou les utilisateurs de la Liste Blanche peuvent y accéder.';
diff --git a/module/doc/lang/vi.php b/module/doc/lang/vi.php
index d232acb35f..b14754bdda 100644
--- a/module/doc/lang/vi.php
+++ b/module/doc/lang/vi.php
@@ -189,6 +189,7 @@ $lang->doc->noEditedDoc          = 'Bạn có not edited any documents.';
 $lang->doc->noOpenedDoc          = 'Bạn chưa tạo any documents.';
 $lang->doc->noCollectedDoc       = 'Bạn có not favorited any documents.';
 $lang->doc->errorEmptyLib        = 'No data in document library.';
+$lang->doc->confirmUpdateContent = 'You have a document that is not saved from last time. Do you want to continue editing it?';
 
 $lang->doc->noticeAcl['lib']['product']['default']   = 'Users who can access the selected product có thể truy cập nó.';
 $lang->doc->noticeAcl['lib']['product']['custom']    = 'Users who can access the selected product or users in the whiltelist có thể truy cập nó.';
diff --git a/module/doc/lang/zh-cn.php b/module/doc/lang/zh-cn.php
index 821eeb15ad..dc928e2572 100644
--- a/module/doc/lang/zh-cn.php
+++ b/module/doc/lang/zh-cn.php
@@ -194,6 +194,7 @@ $lang->doc->noEditedDoc          = '您还没有编辑任何文档。';
 $lang->doc->noOpenedDoc          = '您还没有创建任何文档。';
 $lang->doc->noCollectedDoc       = '您还没有收藏任何文档。';
 $lang->doc->errorEmptyLib        = '文档库暂无数据。';
+$lang->doc->confirmUpdateContent = '检查到您有未保存的文档内容，是否继续编辑？';
 
 $lang->doc->noticeAcl['lib']['product']['default']   = '有所选产品访问权限的用户可以访问。';
 $lang->doc->noticeAcl['lib']['product']['custom']    = '有所选产品访问权限或白名单里的用户可以访问。';
diff --git a/module/doc/model.php b/module/doc/model.php
index 56dd28616c..eb83a89c8a 100644
--- a/module/doc/model.php
+++ b/module/doc/model.php
@@ -421,7 +421,7 @@ class docModel extends model
         $doc->content     = isset($docContent->content) ? $docContent->content : '';
         $doc->contentType = isset($docContent->type)    ? $docContent->type : '';
 
-        if($doc->type != 'url' and $doc->contentType != 'markdown') $doc  = $this->loadModel('file')->replaceImgURL($doc, 'content');
+        if($doc->type != 'url' and $doc->contentType != 'markdown') $doc  = $this->loadModel('file')->replaceImgURL($doc, 'content,tempContent');
         if($setImgSize) $doc->content = $this->file->setImgSize($doc->content);
         $doc->files = $docFiles;
 
@@ -622,6 +622,7 @@ class docModel extends model
         }
         unset($doc->contentType);
 
+        $doc->tempContent = $doc->content;
         $this->dao->update(TABLE_DOC)->data($doc, 'content')
             ->autoCheck()
             ->batchCheck($requiredFields, 'notempty')
@@ -629,11 +630,33 @@ class docModel extends model
             ->exec();
         if(!dao::isError())
         {
+            unset($doc->tempContent);
             $this->file->updateObjectID($this->post->uid, $docID, 'doc');
             return array('changes' => $changes, 'files' => $files);
         }
     }
 
+    /**
+     * Save temporary doc content.
+     *
+     * @param  int    $docID
+     * @access public
+     * @return void
+     */
+    public function saveTempContent($docID)
+    {
+        $data = fixer::input('post')
+            ->stripTags($this->config->doc->editor->edit['id'], $this->config->allowedTags)
+            ->get();
+        $doc  = new stdclass();
+        $doc->tempContent = $data->content;
+
+        $docType = $this->dao->select('type')->from(TABLE_DOCCONTENT)->where('doc')->eq((int)$docID)->orderBy('version_desc')->fetch();
+        if($docType == 'markdown') $doc->tempContent = $this->post->content;
+
+        $this->dao->update(TABLE_DOC)->data($doc)->where('id')->eq($docID)->exec();
+    }
+
     /**
      * Build search form.
      *
diff --git a/module/doc/view/edit.html.php b/module/doc/view/edit.html.php
index 1b346fb5ea..c07f21e464 100644
--- a/module/doc/view/edit.html.php
+++ b/module/doc/view/edit.html.php
@@ -13,6 +13,10 @@
 <?php include '../../common/view/header.html.php';?>
 <?php if($doc->contentType == 'html')     include '../../common/view/kindeditor.html.php';?>
 <?php if($doc->contentType == 'markdown') include '../../common/view/markdown.html.php';?>
+<?php js::set('needUpdateContent', $doc->content != $doc->tempContent);?>
+<?php js::set('confirmUpdateContent', $lang->doc->confirmUpdateContent);?>
+<?php js::set('docID', $doc->id);?>
+<?php js::set('tempContent', $doc->tempContent);?>
 <div id='mainContent' class='main-content'>
   <div class='center-block'>
     <div class='main-header'>