diff --git a/module/api/control.php b/module/api/control.php
index 19b1bfa7f1..d66698951e 100755
--- a/module/api/control.php
+++ b/module/api/control.php
@@ -674,6 +674,11 @@ EOT;
             $selected = $key == $libID ? 'selected' : '';
             $output  .= html::a(inlink($methodName, "libID=$key"), $lib->name, '', "class='$selected' data-app='{$this->app->tab}'");
         }
+        if(count($libs) >= 2 and common::hasPriv('doc', 'sortLibs'))
+        {
+            $output   .= '<li class="divider"></li>';
+            $output   .= html::a($this->createLink('doc', 'sortLibs', "type=api&objectID=0", '', true), "<i class='icon-move'></i>  {$this->lang->doc->sortLibs}", '', "data-title='{$this->lang->doc->sortLibs}' data-toggle='modal' data-type='iframe' data-width='400px' data-app='{$this->app->tab}'");
+        }
         $output .= "</div></div></div></div></div>";
 
         /* Get lib version */
diff --git a/module/doc/control.php b/module/doc/control.php
index 9f6a58abb5..2e4261d9a8 100755
--- a/module/doc/control.php
+++ b/module/doc/control.php
@@ -1199,4 +1199,22 @@ class doc extends control
         unset($this->lang->doc->libTypeList['book']);
         $this->display();
     }
+
+    /**
+     * Sort libs.
+     *
+     * @access public
+     * @return void
+     */
+    public function sortLibs($type, $objectID)
+    {
+        if(!empty($_POST))
+        {
+            $this->doc->updateLibOrder();
+            return print(js::reload('parent.parent'));
+        }
+        $this->view->title = $this->lang->doc->sortLibs;
+        $this->view->libs  = $this->doc->getLibs($type, '', '', $objectID);
+        $this->display();
+    }
 }
diff --git a/module/doc/css/common.css b/module/doc/css/common.css
index 5e2b577193..a9b746c106 100644
--- a/module/doc/css/common.css
+++ b/module/doc/css/common.css
@@ -103,3 +103,4 @@ ol, ul {margin-bottom: 0}
 .fullscreen-close {top: 8px !important;}
 
 #subHeader .list-group>a.selected {color: #e9f2fb !important; background-color: #0c64eb !important;}
+#pageNav #dropMenu .table-col .list-group .icon-move {display:block; float: left; font-size: 12px; padding: 3px 4px 3px 1px;}
diff --git a/module/doc/css/sortlibs.css b/module/doc/css/sortlibs.css
new file mode 100644
index 0000000000..e8ec94be34
--- /dev/null
+++ b/module/doc/css/sortlibs.css
@@ -0,0 +1,4 @@
+#mainContent .doclib-name {font-size: 13px; font-weight: 550; padding: 10px 0px;}
+#mainContent #libs .lib > .icon-move {padding-left: 4px; font-size:13px; vertical-align: text-top;}
+#mainContent #libs .lib {padding-bottom: 5px;}
+#mainContent #libs {padding-bottom: 10px;}
diff --git a/module/doc/js/sortlibs.js b/module/doc/js/sortlibs.js
new file mode 100644
index 0000000000..7e86f69b58
--- /dev/null
+++ b/module/doc/js/sortlibs.js
@@ -0,0 +1,31 @@
+$(function()
+{
+    /* Make libs sortable. */
+    $('#libs').sortable(
+    {
+        trigger: '.lib > .icon-move, .lib > .lib-name',
+        dropToClass: 'sort-to',
+        stopPropagation: true,
+        nested: true,
+        selector: 'div',
+        dragCssClass: 'drop-here',
+        targetSelector: function($ele, $root)
+        {
+            var $libs = $ele.closest('#libs');
+            return $libs.children('div.lib');
+        },
+        always: function()
+        {
+            $('#libs,#libs .is-sorting').removeClass('is-sorting');
+        },
+        finish: function(e)
+        {
+            var orders = ',';
+            $('#libs').find('div.lib').each(function()
+            {
+                orders += $(this).attr('data-id') + ',';
+            });
+            $('#libs #libIdList').attr('value', orders);
+        }
+    });
+});
diff --git a/module/doc/lang/en.php b/module/doc/lang/en.php
index 25738bfb22..d3e052be03 100644
--- a/module/doc/lang/en.php
+++ b/module/doc/lang/en.php
@@ -151,6 +151,7 @@ $lang->doc->removeMenu     = 'Remove from Menu';
 $lang->doc->search         = 'Search';
 $lang->doc->allCollections = 'All Collections';
 $lang->doc->keywordsTips   = 'Please use commas to separate keywords.';
+$lang->doc->sortLibs       = 'Sort Libs';
 
 global $config;
 /* Query condition list. */
diff --git a/module/doc/lang/zh-cn.php b/module/doc/lang/zh-cn.php
index 112b990c3d..b879716bfd 100644
--- a/module/doc/lang/zh-cn.php
+++ b/module/doc/lang/zh-cn.php
@@ -151,6 +151,7 @@ $lang->doc->removeMenu     = '从菜单栏移除';
 $lang->doc->search         = '搜索';
 $lang->doc->allCollections = '查看全部收藏文档';
 $lang->doc->keywordsTips   = '多个关键字请用逗号分隔。';
+$lang->doc->sortLibs       = '文档库排序';
 
 global $config;
 /* 查询条件列表 */
diff --git a/module/doc/model.php b/module/doc/model.php
index 7fe3134a2a..6527b467d5 100644
--- a/module/doc/model.php
+++ b/module/doc/model.php
@@ -48,7 +48,7 @@ class docModel extends model
             ->where('deleted')->eq(0)
             ->andWhere('type')->eq('api')
             ->beginIF(!empty($appendLib))->orWhere('id')->eq($appendLib)->fi()
-            ->orderBy('id_desc')
+            ->orderBy('`order`_asc, id_desc')
             ->fetchAll('id');
         $libs = array_filter($libs, array($this, 'checkPrivLib'));
         return $libs;
@@ -61,6 +61,7 @@ class docModel extends model
      * @param  string $extra
      * @param  string $appendLibs
      * @param  int    $projectID
+     *
      * @access public
      * @return array
      */
@@ -72,7 +73,7 @@ class docModel extends model
                 ->where('type')->ne('api')
                 ->beginIF($type == 'all')->andWhere('deleted')->eq(0)->fi()
                 ->andWhere('vision')->eq($this->config->vision)
-                ->orderBy('id_desc')
+                ->orderBy('`order` asc, id_desc')
                 ->query();
         }
         else
@@ -83,7 +84,7 @@ class docModel extends model
                 ->beginIF($type)->andWhere('type')->eq($type)->fi()
                 ->beginIF(!$type)->andWhere('type')->ne('api')->fi()
                 ->beginIF($objectID and strpos(',product,project,execution,', ",$type,") !== false)->andWhere($type)->eq($objectID)->fi()
-                ->orderBy('`order`, id desc')->query();
+                ->orderBy("`order` asc, id_desc")->query();
         }
 
         $products   = $this->loadModel('product')->getPairs();
@@ -128,7 +129,7 @@ class docModel extends model
 
         if(!empty($appendLibs))
         {
-            $stmt = $this->dao->select('*')->from(TABLE_DOCLIB)->where('id')->in($appendLibs)->orderBy('`order`, id desc')->query();
+            $stmt = $this->dao->select('*')->from(TABLE_DOCLIB)->where('id')->in($appendLibs)->orderBy("`order` asc, id_desc")->query();
             while($lib = $stmt->fetch())
             {
                 if(!isset($libPairs[$lib->id]) and $this->checkPrivLib($lib, $extra)) $libPairs[$lib->id] = $lib->name;
@@ -1401,8 +1402,8 @@ class docModel extends model
                 ->andWhere('vision')->eq($this->config->vision)
                 ->andWhere('type')->eq($type)
                 ->beginIF(!empty($appendLib))->orWhere('id')->eq($appendLib)->fi()
-                ->beginIF($type == 'custom')->orderBy('`order`, id')->fi()
-                ->beginIF($type == 'book')->orderBy('id_desc')->fi()
+                ->beginIF($type == 'custom')->orderBy('`order` asc, id_desc')->fi()
+                ->beginIF($type == 'book')->orderBy('`order` asc, id_desc')->fi()
                 ->fetchAll('id');
         }
         elseif($type != 'product' and $type != 'project' and $type != 'execution')
@@ -1417,7 +1418,7 @@ class docModel extends model
                 ->andWhere($type)->eq($objectID)
                 ->beginIF(!empty($appendLib))->orWhere('id')->eq($appendLib)->fi()
                 ->beginIF($type == 'project')->andWhere('execution')->eq(0)->fi()
-                ->orderBy('`order`, id')
+                ->orderBy('`order` asc, id_desc')
                 ->fetchAll('id');
         }
 
@@ -2360,6 +2361,11 @@ EOT;
                 $selected = empty($libID) ? 'selected' : '';
                 $output   .= html::a(inlink('showFiles', "type=$type&objectID=$objectID"), $this->lang->doclib->files, '', "class='$selected' data-app='{$this->app->tab}'");
             }
+            if(count($libs) >= 2 and common::hasPriv('doc', 'sortLibs'))
+            {
+                $output   .= '<li class="divider"></li>';
+                $output   .= html::a(inlink('sortLibs', "type=$type&objectID=$objectID", '', true), "<i class='icon-move'></i>  {$this->lang->doc->sortLibs}", '', "data-title='{$this->lang->doc->sortLibs}' data-toggle='modal' data-type='iframe' data-width='400px' data-app='{$this->app->tab}'");
+            }
             $output .= "</div></div></div></div></div>";
         }
 
@@ -2767,7 +2773,7 @@ EOT;
             $table    = $this->config->objectTables[$type];
             $libs     = $this->getLibsByObject($type, $objectID, '', $appendLib);
 
-            if($libID == 0) $libID = key($libs);
+            if($libID == 0) $libID = reset($libs)->id;
             $this->lang->modulePageNav = $this->select($type, $objects, $objectID, $libs, $libID);
 
             if($this->app->tab == 'doc') $this->app->rawMethod = $type;
@@ -2812,4 +2818,26 @@ EOT;
 
         return $autoloadPage;
     }
+
+    /**
+     * Update Lib orders.
+     *
+     * @access public
+     * @return void
+     */
+    public function updateLibOrder()
+    {
+        $libIdList = $this->post->libIdList;
+        $libIdList = explode(',', $libIdList);
+
+        $order = 1;
+        foreach($libIdList as $libID)
+        {
+            if(!$libID) continue;
+
+            $this->dao->update(TABLE_DOCLIB)->set('`order`')->eq($order * 10)->where('id')->eq($libID)->exec();
+
+            $order++;
+        }
+    }
 }
diff --git a/module/doc/view/sortlibs.html.php b/module/doc/view/sortlibs.html.php
new file mode 100644
index 0000000000..b16f7f59e9
--- /dev/null
+++ b/module/doc/view/sortlibs.html.php
@@ -0,0 +1,33 @@
+<?php
+/**
+ * The sortlibs view file of doc module of ZenTaoPMS.
+ *
+ * @copyright   Copyright 2009-2022 青岛易软天创网络科技有限公司(QingDao Nature Easy Soft Network Technology Co,LTD, www.cnezsoft.com)
+ * @license     ZPL(http://zpl.pub/page/zplv12.html) or AGPL(https://www.gnu.org/licenses/agpl-3.0.en.html)
+ * @author      Mengyi Liu <liumengyi@easycorp.ltd>
+ * @package     doc
+ * @version     $Id: sorlibs.html.php 958 2022-06-21 14:20:42Z $
+ * @link        https://www.zentao.net
+ */
+?>
+<?php include '../../common/view/header.html.php';?>
+<div id="main">
+  <div class='main-header'>
+    <h2><?php echo $lang->doc->order;?></h2>
+  </div>
+  <div id='mainContent' class='main-content'>
+    <div class='doclib-name'><?php echo $lang->doclib->name?></div>
+    <?php $libIdList = ',';?>
+    <form id='libs' class='load-indicator main-form' method='post' target='hiddenwin'>
+      <?php foreach($libs as $libID => $libName):?>
+      <?php $libIdList .= "$libID,";?>
+      <div class='lib' data-id='<?php echo $libID;?>'>
+        <span class='lib-name'><?php echo $libName;?></span><i class='icon-move'></i>
+      </div>
+      <?php endforeach;?>
+      <?php echo html::hidden('libIdList', trim($libIdList, ','));?>
+      <div class='text-center'><?php echo html::submitButton($lang->save);?></div>
+    </form>
+  </div>
+</div>
+<?php include '../../common/view/footer.html.php';?>