diff --git a/module/program/control.php b/module/program/control.php
index 64399e5694..9d1fd368cd 100644
--- a/module/program/control.php
+++ b/module/program/control.php
@@ -840,7 +840,7 @@ class program extends control
      * @access public
      * @return void
      */
-    public function PRJEdit($projectID = 0)
+    public function PRJEdit($projectID = 0, $parentID = 0)
     {
         $this->lang->navGroup->program = 'project';
         $this->app->loadLang('project');
@@ -867,24 +867,29 @@ class program extends control
         $project     = $this->program->getPRJByID($projectID);
         $parents     = $this->program->getParentPairs();
         $programID   = $this->program->getPRJProgramID($projectID);
-        $allProducts = $this->program->getPGMProduct($programID);
-        $linkedProducts = $this->project->getProducts($projectID);
-        $linkedBranches = array();
-        foreach($linkedProducts as $product)
-        {
-            if(!isset($allProducts[$product->id])) $allProducts[$product->id] = $product->name;
-            if($product->branch) $linkedBranches[$product->branch] = $product->branch;
-        }
-        foreach($linkedProducts as $product)
-        {
-            if(!isset($allProducts[$product->id])) $allProducts[$product->id] = $product->name;
-            if($product->branch) $linkedBranches[$product->branch] = $product->branch;
-        }
 
-        $productPlans = array(0 => '');
-        foreach($linkedProducts as $product)
+
+        $linkedProducts = array();
+        $linkedBranches = array();
+        $productPlans   = array(0 => '');
+        if($parentID)
         {
-            $productPlans[$product->id] = $this->productplan->getPairs($product->id);
+            $allProducts = $this->program->getPGMProduct($parentID);
+        }
+        else
+        {
+            $allProducts    = $this->program->getPGMProduct($projectID);
+            $linkedProducts = $this->project->getProducts($projectID);
+            foreach($linkedProducts as $product)
+            {
+                if(!isset($allProducts[$product->id])) $allProducts[$product->id] = $product->name;
+                if($product->branch) $linkedBranches[$product->branch] = $product->branch;
+            }
+
+            foreach($linkedProducts as $product)
+            {
+                $productPlans[$product->id] = $this->loadModel('productplan')->getPairs($product->id);
+            }
         }
 
         $this->view->title      = $this->lang->program->PRJEdit;
@@ -894,6 +899,7 @@ class program extends control
         $this->view->users          = $this->user->getPairs('noclosed|nodeleted');
         $this->view->project        = $project;
         $this->view->parents        = $parents;
+        $this->view->parentID       = $parentID;
         $this->view->allProducts    = array('0' => '') + $allProducts;
         $this->view->productPlans   = $productPlans;
         $this->view->linkedProducts = $linkedProducts;
diff --git a/module/program/js/prjedit.js b/module/program/js/prjedit.js
index 274d34b92b..c7befb897c 100644
--- a/module/program/js/prjedit.js
+++ b/module/program/js/prjedit.js
@@ -13,6 +13,11 @@ $(function()
         }
     });
 
+    $('#parent').click(function()
+    {
+        if(!confirm(PGMChangeTips)) return false;
+    })
+
     adjustProductBoxMargin();
     adjustPlanBoxMargin();
 });
@@ -28,3 +33,18 @@ function setAclList(programID)
         $('.aclBox').html($('#PRJAcl').html());
     }
 }
+
+function setParentProgram()
+{
+    var parentProgram = $("#parent").val();
+
+    if(confirm(PGMChangeTips))
+    {
+        location.href = createLink('program', 'PRJEdit', 'projectID=' + projectID + '&programID=' + parentProgram);
+    }
+    else
+    {
+        $('#parent').val(oldParent);
+        $("#parent").trigger("chosen:updated");
+    }
+}
diff --git a/module/program/lang/zh-cn.php b/module/program/lang/zh-cn.php
index e96201ddd1..62735cdace 100644
--- a/module/program/lang/zh-cn.php
+++ b/module/program/lang/zh-cn.php
@@ -207,6 +207,7 @@ $lang->program->PGMLongTime  = '长期项目';
 $lang->program->noPGM         = '暂时没有项目集';
 $lang->program->PGMShowClosed = '显示已关闭';
 $lang->program->PGMTips       = '修改父项目集，可关联产品也会发生变化，并且变为必填，如果未选择任何项目集，则系统会默认创建一个和该项目同名的产品并关联到该项目。';
+$lang->program->PGMChangeTips = '修改父项目集后，项目已关联的产品会被清空，并且项目下的需求、bug等数据也会受影响，是否修改？';
 
 $lang->program->PGMAclList['open']    = "公开（有项目集视图权限，即可访问）";
 $lang->program->PGMAclList['private'] = "私有（项目集负责人和干系人可访问）";
diff --git a/module/program/model.php b/module/program/model.php
index 5d7a37fe20..5c6086e734 100644
--- a/module/program/model.php
+++ b/module/program/model.php
@@ -1135,6 +1135,7 @@ class programModel extends model
                 if(dao::isError()) return false;
             }
 
+            /* Judge products not empty. */
             if(!$_POST['products'][0]) 
             {
                 dao::$errors[] = $this->lang->program->productNotEmpty;
@@ -1162,13 +1163,13 @@ class programModel extends model
             $this->loadModel('personnel')->updateWhitelist($whitelist, 'project', $projectID);
             if($project->acl != 'open') $this->loadModel('user')->updateUserView($projectID, 'project');
             
-            /* If parent not empty, link products or create products. */
             if($project->parent) 
             {
                 $this->loadModel('project')->updateProducts($projectID);
             }
             else
             {
+                /* If parent not empty, link products or create products. */
                 $product = new stdclass();
                 $product->name        = $project->name;
                 $product->code        = $project->code;
@@ -1258,6 +1259,13 @@ class programModel extends model
 
                 if(dao::isError()) return false;
             }
+
+            /* Judge products not empty. */
+            if(!$_POST['products'][0]) 
+            {
+                dao::$errors[] = $this->lang->program->productNotEmpty;
+                return false;
+            }
         }
 
         $project = $this->loadModel('file')->processImgURL($project, $this->config->program->editor->prjedit['id'], $this->post->uid);
@@ -1278,6 +1286,8 @@ class programModel extends model
 
         if(!dao::isError())
         {
+            if($project->parent != $oldProject->parent) $this->loadModel('project')->updateProducts($projectID);
+
             $this->file->updateObjectID($this->post->uid, $projectID, 'project');
             $whitelist = explode(',', $project->whitelist);
             $this->loadModel('personnel')->updateWhitelist($whitelist, 'project', $projectID);
diff --git a/module/program/view/prjedit.html.php b/module/program/view/prjedit.html.php
index 1a2068be71..169698f92f 100644
--- a/module/program/view/prjedit.html.php
+++ b/module/program/view/prjedit.html.php
@@ -15,6 +15,10 @@
 <?php js::import($jsRoot . 'misc/date.js');?>
 <?php js::set('weekend', $config->project->weekend);?>
 <?php js::set('errorSameProducts', $lang->project->errorSameProducts);?>
+<?php js::set('parentID', $parentID);?>
+<?php js::set('oldParent', $project->parent);?>
+<?php js::set('projectID', $project->id);?>
+<?php js::set('PGMChangeTips', $lang->program->PGMChangeTips);?>
 <?php $aclList = $project->parent ? $lang->program->PGMPRJAclList : $lang->program->PRJAclList;?>
 <div id='mainContent' class='main-content'>
   <div class='center-block'>
@@ -30,7 +34,9 @@
         </tr>
         <tr>
           <th><?php echo $lang->program->PGMParent;?></th>
-          <td><?php echo zget($parents, $project->parent, '/');?></td>
+          <td><?php echo html::select('parent', $parents, $parentID ? $parentID : $project->parent, "class='form-control chosen' onchange='setParentProgram(this.value)'");?></td>
+          <td></td>
+          <td></td>
         </tr>
         <tr>
           <th><?php echo $lang->program->PRJName;?></th>
@@ -68,7 +74,7 @@
               </div>
               <?php $i++;?>
               <?php endforeach;?>
-              <div class='col-sm-4'>
+                <div class='col-sm-4  <?php if($parentID) echo 'required';?>'>
                 <div class='input-group'>
                   <?php echo html::select("products[$i]", $allProducts, '', "class='form-control chosen' onchange='loadBranches(this)'");?>
                   <span class='input-group-addon fix-border'></span>