diff --git a/module/extension/config.php b/module/extension/config.php
new file mode 100644
index 0000000000..ae6636b0c8
--- /dev/null
+++ b/module/extension/config.php
@@ -0,0 +1,2 @@
+<?php
+$config->extension->apiRoot = 'http://www.zentao.net/extension-';
diff --git a/module/extension/control.php b/module/extension/control.php
index 89cccd5283..bf471d3a92 100644
--- a/module/extension/control.php
+++ b/module/extension/control.php
@@ -22,19 +22,60 @@ class extension extends control
     {
         $this->view->header->title = $this->lang->extension->browse;
         $this->view->position[]    = $this->lang->extension->browse;
+        $this->view->tab           = $type;
         $this->display();
     }
 
-    public function download()
+    /**
+     * Obtain an extension from the community.
+     * 
+     * @param  string $type 
+     * @param  string $param 
+     * @access public
+     * @return void
+     */
+    public function obtain($type = 'byDownloads', $param = '', $recTotal = 0, $recPerPage = 10, $pageID = 1)
     {
+        /* Init vars. */
+        $type       = strtolower($type);
+        $moduleID   = $type == 'bymodule' ? (int)$param : 0;
+        $extensions = array();
+        $pager      = null;
+
+        /* Get results from the api. */
+        $results = $this->extension->getExtensionsByAPI($type, $param, $recTotal, $recPerPage, $pageID);
+        if($results)
+        {
+            $this->app->loadClass('pager', $static = true);
+            $pager      = new pager($results->dbPager->recTotal, $results->dbPager->recPerPage, $results->dbPager->pageID);
+            $extensions = $results->extensions;
+        }
+
+        $this->view->moduleTree = $this->extension->getModulesByAPI();
+        $this->view->extensions = $extensions;
+        $this->view->pager      = $pager;
+        $this->view->tab        = 'obtain';
+        $this->view->type       = $type;
+        $this->view->moduleID   = $moduleID;
+        $this->display();
     }
 
-    public function upload()
+    /**
+     * Install a extension
+     * 
+     * @param  int    $downLink 
+     * @access public
+     * @return void
+     */
+    public function install($extension, $downLink = '')
     {
-    }
+        if($downLink) $this->extension->download($extension, helper::safe64Decode($downLink));
 
-    public function install($extension)
-    {
+        $packgeFile = $this->extension->getPackageFile($extension);
+        if(!file_exists($packgeFile)) die(js::error('not found'));
+
+        $this->extension->install($extension);
+        echo 'installed';
     }
 
     public function uninstall()
diff --git a/module/extension/css/obtain.css b/module/extension/css/obtain.css
new file mode 100644
index 0000000000..a68e3f9d4f
--- /dev/null
+++ b/module/extension/css/obtain.css
@@ -0,0 +1,2 @@
+.active a {color:blue; font-weight:bold;}
+.button-c {padding:4px 6px}
diff --git a/module/extension/lang/zh-cn.php b/module/extension/lang/zh-cn.php
index e418f572ad..671118a862 100644
--- a/module/extension/lang/zh-cn.php
+++ b/module/extension/lang/zh-cn.php
@@ -12,19 +12,32 @@
 $lang->extension->common    = '插件管理';
 $lang->extension->browse    = '浏览插件';
 $lang->extension->install   = '安装插件';
+$lang->extension->installAB = '安装';
 $lang->extension->uninstall = '卸载插件';
 $lang->extension->activate  = '激活插件';
 $lang->extension->deactivate= '禁用插件';
+$lang->extension->obtain    = '获得插件';
 $lang->extension->download  = '下载插件';
+$lang->extension->downloadAB= '下载';
 $lang->extension->upload    = '上传插件';
 
 $lang->extension->installed   = '已安装';
 $lang->extension->deactivated = '已禁用';
 $lang->extension->available   = '可安装';
 
-$lang->extension->name    = '插件名称';
-$lang->extension->version = '插件版本';
-$lang->extension->author  = '插件作者';
-$lang->extension->license = '授权协议';
-$lang->extension->desc    = '插件描述';
-$lang->extension->site    = '官方网站';
+$lang->extension->id          = '编号';
+$lang->extension->name        = '名称';
+$lang->extension->version     = '版本';
+$lang->extension->author      = '作者';
+$lang->extension->license     = '授权';
+$lang->extension->desc        = '描述';
+$lang->extension->site        = '官方网站';
+$lang->extension->addedTime   = '添加时间';
+$lang->extension->updatedTime = '更新时间';
+$lang->extension->downloads   = '下载';
+
+$lang->extension->byDownloads   = '最多下载';
+$lang->extension->byAddedTime   = '最新添加';
+$lang->extension->byUpdatedTime = '最近更新';
+$lang->extension->bySearch      = '搜索';
+$lang->extension->byCategory    = '分类浏览';
diff --git a/module/extension/model.php b/module/extension/model.php
index e3fcf683e6..b338e4b4af 100644
--- a/module/extension/model.php
+++ b/module/extension/model.php
@@ -11,6 +11,157 @@
  */
 class extensionModel extends model
 {
+    /**
+     * The api agent(use snoopy).
+     * 
+     * @var object   
+     * @access public
+     */
+    public $agent;
+
+    /**
+     * The api root.
+     * 
+     * @var string
+     * @access public
+     */
+    public $apiRoot;
+
+    /**
+     * The construct function.
+     * 
+     * @access public
+     * @return void
+     */
+    public function __construct()
+    {
+        parent::__construct();
+        $this->setAgent();
+        $this->setApiRoot();
+    }
+
+    /**
+     * Set the api agent.
+     * 
+     * @access public
+     * @return void
+     */
+    public function setAgent()
+    {
+        $this->agent = $this->app->loadClass('snoopy');
+    }
+
+    /**
+     * Set the apiRoot.
+     * 
+     * @access public
+     * @return void
+     */
+    public function setApiRoot()
+    {
+        $this->apiRoot = $this->config->extension->apiRoot;
+    }
+
+    /**
+     * Fetch data from an api.
+     * 
+     * @param  string    $url 
+     * @access public
+     * @return mixed
+     */
+    public function fetchAPI($url)
+    {
+        $this->agent->fetch($url);
+        $result = json_decode($this->agent->results);
+        if(!isset($result->status)) return false;
+        if($result->status != 'success') return false;
+        if(isset($result->data) and md5($result->data) != $result->md5) return false;
+        if(isset($result->data)) return json_decode($result->data);
+    }
+
+    /**
+     * Get extension modules from the api.
+     * 
+     * @access public
+     * @return void
+     */
+    public function getModulesByAPI()
+    {
+        $requestType = $this->config->requestType;
+        $webRoot     = helper::safe64Encode($this->config->webRoot);
+        $apiURL      = $this->apiRoot . 'apiGetmodules-' . $requestType . '-' . $webRoot . '.json';
+        $data = $this->fetchAPI($apiURL);
+        if(isset($data->modules)) return $data->modules;
+        return false;
+    }
+
+    /**
+     * Get extensions by some condition.
+     * 
+     * @param  string    $type 
+     * @param  mixe d    $param 
+     * @access public
+     * @return void
+     */
+    public function getExtensionsByAPI($type, $param)
+    {
+        $apiURL = $this->apiRoot . 'apiGetExtensions-' . $type . '-' . $param . '.json';
+        $data = $this->fetchAPI($apiURL);
+        if(isset($data->extensions)) return $data;
+        return false;
+    }
+
+    /**
+     * Get the full path of the zip file of a extension. 
+     * 
+     * @param  string    $extension 
+     * @access public
+     * @return string
+     */
+    public function getPackageFile($extension)
+    {
+        return $this->app->getTmpRoot() . 'extension/' . $extension . '.zip';
+    }
+
+    /**
+     * Install an extension.
+     * 
+     * @param  string    $extension 
+     * @access public
+     * @return void
+     */
+    public function install($extension)
+    {
+        $packageFile = $this->getPackageFile($extension);
+
+        /* Extract the zip file. */
+        $this->app->loadClass('pclzip', true);
+        $zip = new pclzip($packageFile);
+        $zip->extract(PCLZIP_OPT_PATH, 'ext');
+
+        /* Copy to the destination. */
+        $this->xcopy("ext/$extension/module", $this->app->getAppRoot() . 'module');
+        $this->xcopy("ext/$extension/www",    $this->app->getAppRoot() . 'www');
+        $this->xcopy("ext/$extension/bin",    $this->app->getAppRoot() . 'bin');
+        $this->xcopy("ext/$extension/config", $this->app->getAppRoot() . 'config');
+        $this->xcopy("ext/$extension/lib",    $this->app->getAppRoot() . 'bli');
+    }
+
+    /**
+     * Download an extension.
+     * 
+     * @param  string    $extension 
+     * @param  string    $downLink 
+     * @access public
+     * @return void
+     */
+    public function download($extension, $downLink)
+    {
+        $packageFile = $this->getPackageFile($extension);
+        $this->agent->fetch($downLink);
+        file_put_contents($packageFile, $this->agent->results);
+    }
+
     /**
      * Copy a directory from an directory to another directory.
      * 
diff --git a/module/extension/view/browse.html.php b/module/extension/view/browse.html.php
index 2ed245517f..cd3b962368 100644
--- a/module/extension/view/browse.html.php
+++ b/module/extension/view/browse.html.php
@@ -10,18 +10,7 @@
  * @link        http://www.zentao.net
  */
 ?>
-<?php include '../../common/view/header.html.php';?>
-<?php include '../../common/view/tablesorter.html.php';?>
-<div id='featurebar'>
-  <?php 
-  echo '<span id="installed">'  . html::a(inlink('browse', "type=installed"),   $lang->extension->installed)   . '</span>';
-  echo '<span id="deactivated">'. html::a(inlink('browse', "type=deactivated"), $lang->extension->deactivated) . '</span>';
-  echo '<span id="available">'  . html::a(inlink('browse', "type=available"),   $lang->extension->available )  . '</span>';
-  echo '<span id="download">'   . html::a(inlink('download'), $lang->extension->download) . '</span>';
-  echo '<span id="upload" >'    . html::a(inlink('upload'),   $lang->extension->upload) . '</span>';
-  ?>
-  <script>$('#<?php echo $type;?>').addClass('active')</script>
-</div>
+<?php include 'header.html.php';?>
 <table class='table-1 tablesorter'>
   <thead>
   <tr class='colhead'>
@@ -29,7 +18,16 @@
     <th><?php echo $lang->extension->version;?></th>
     <th><?php echo $lang->extension->author;?></th>
     <th><?php echo $lang->extension->desc;?></th>
+    <th>操作</th>
   </tr>
   </thead>
+  <tbody>
+  <tr >
+    <td><?php echo $lang->extension->name;?></td>
+    <td><?php echo $lang->extension->version;?></td>
+    <td><?php echo $lang->extension->author;?></td>
+    <td><?php echo $lang->extension->desc;?></td>
+  </tr>
+  </tbody>
 </table>
 <?php include '../../common/view/footer.html.php';?>
diff --git a/module/extension/view/header.html.php b/module/extension/view/header.html.php
new file mode 100644
index 0000000000..bb4317b692
--- /dev/null
+++ b/module/extension/view/header.html.php
@@ -0,0 +1,12 @@
+<?php include '../../common/view/header.html.php';?>
+<?php include '../../common/view/tablesorter.html.php';?>
+<div id='featurebar'>
+  <?php 
+  echo '<span id="installed">'  . html::a(inlink('browse', "type=installed"),   $lang->extension->installed)   . '</span>';
+  echo '<span id="deactivated">'. html::a(inlink('browse', "type=deactivated"), $lang->extension->deactivated) . '</span>';
+  echo '<span id="available">'  . html::a(inlink('browse', "type=available"),   $lang->extension->available )  . '</span>';
+  echo '<span id="obtain">  '   . html::a(inlink('obtain'), $lang->extension->obtain) . '</span>';
+  echo '<span id="upload" >'    . html::a(inlink('upload'),   $lang->extension->upload) . '</span>';
+  ?>
+  <script>$('#<?php echo $tab;?>').addClass('active')</script>
+</div>
diff --git a/module/extension/view/obtain.html.php b/module/extension/view/obtain.html.php
new file mode 100644
index 0000000000..102780ba89
--- /dev/null
+++ b/module/extension/view/obtain.html.php
@@ -0,0 +1,82 @@
+<?php
+/**
+ * The obtain view file of extension module of ZenTaoPMS.
+ *
+ * @copyright   Copyright 2009-2011 QingDao Nature Easy Soft Network Technology Co,LTD (www.cnezsoft.com)
+ * @license     LGPL (http://www.gnu.org/licenses/lgpl.html)
+ * @author      Chunsheng Wang <chunsheng@cnezsoft.com>
+ * @package     extension
+ * @version     $Id$
+ * @link        http://www.zentao.net
+ */
+?>
+<?php include 'header.html.php';?>
+<?php include '../../common/view/treeview.html.php';?>
+<table class='cont-lt1'>
+  <tr valign='top'>
+    <td class='side'>
+      <div class='box-title'><?php echo $lang->extension->obtain;?></div>
+      <div class='box-content a-center'>
+        <?php
+        echo "<span id='bydownloads'>"   . html::a(inlink('obtain', 'type=byDownloads'),   $lang->extension->byDownloads)   . '</span><br />';
+        echo "<span id='byaddedtime'>"   . html::a(inlink('obtain', 'type=byAddedTime'),   $lang->extension->byAddedTime)   . '</span><br />';
+        echo "<span id='byupdatedtime'>" . html::a(inlink('obtain', 'type=byUpdatedTime'), $lang->extension->byUpdatedTime) . '</span><br />';
+        ?>
+      </div>
+      <div class='box-title'><?php echo $lang->extension->bySearch;?></div>
+      <div class='box-content a-center'>
+        <form method='post'>
+        <?php
+        echo html::input('key', '', "class='text-1'") . html::submitButton($lang->extension->bySearch);
+        ?>
+        </form>
+      </div>
+      <div class='box-title'><?php echo $lang->extension->byCategory;?></div>
+      <div class='box-content' id='tree'>
+        <?php echo $moduleTree;?>
+      </div>
+    </td>
+    <td class='divider'></td>
+    <td> 
+      <table class='table-1 tablesorter'>
+        <thead>
+        <tr class='colhead'>
+          <th class='w-id'><?php echo $lang->extension->id;?></th>
+          <th class='w-150px'><?php echo $lang->extension->name;?></th>
+          <th class='w-50px'><?php echo $lang->extension->version;?></th>
+          <th><?php echo $lang->extension->desc;?></th>
+          <th><?php echo $lang->extension->author;?></th>
+          <th class='w-id'><?php echo $lang->extension->downloads;?></th>
+          <th class='w-100px'>操作</th>
+        </tr>
+        </thead>
+        <tbody>
+        <?php foreach($extensions as $extension):?>
+        <tr class='a-center'>
+          <td class='strong'><?php echo $extension->id;?></td>
+          <td class='a-left'><?php echo $extension->name;?></td>
+          <td><?php echo $extension->version;?></td>
+          <td class='a-left'><?php echo $extension->desc;?></td>
+          <td><?php echo $extension->author;?></td>
+          <td><?php echo $extension->downloads;?></td>
+          <td>
+            <?php 
+            echo html::linkButton($lang->extension->installAB,  inlink('install',  "extension=$extension->code&downLink=" . helper::safe64Encode($extension->downLink)));
+            echo html::linkButton($lang->extension->downloadAB, $extension->downLink);
+            ?>
+          </td>
+        </tr>
+        <?php endforeach;?>
+        </tbody>
+        <tfoot>
+          <tr><td class='a-right' colspan='7'><?php if($pager) $pager->show();?></td></tr>
+        </tfoot>
+      </table>
+    </td>
+  </tr>
+</table>
+<script>
+$('#<?php echo $type;?>').addClass('active')
+$('#module<?php echo $moduleID;?>').addClass('active')
+</script>
+<?php include '../../common/view/footer.html.php';?>