diff --git a/db/zentao.sql b/db/zentao.sql
index 0501dc8774..d9ba2e42a1 100644
--- a/db/zentao.sql
+++ b/db/zentao.sql
@@ -837,7 +837,7 @@ CREATE TABLE IF NOT EXISTS `zt_projectproduct` (
   `product` mediumint(8) unsigned NOT NULL,
   `branch` mediumint(8) unsigned NOT NULL,
   `plan` mediumint(8) unsigned NOT NULL,
-  PRIMARY KEY  (`project`,`product`)
+  PRIMARY KEY  (`project`,`product`, `branch`)
 ) ENGINE=MyISAM DEFAULT CHARSET=utf8;
 -- DROP TABLE IF EXISTS `zt_projectspec`;
 CREATE TABLE IF NOT EXISTS `zt_projectspec` (
diff --git a/module/branch/lang/de.php b/module/branch/lang/de.php
index e4e5855de3..d3bbb31a21 100644
--- a/module/branch/lang/de.php
+++ b/module/branch/lang/de.php
@@ -7,6 +7,7 @@ $lang->branch->add    = 'Hinzufügen';
 
 $lang->branch->manageTitle = '%s Management';
 $lang->branch->all         = 'Alle ';
+$lang->branch->main        = 'Trunk';
 
 $lang->branch->id      = 'ID';
 $lang->branch->product = 'Produkt';
diff --git a/module/branch/lang/en.php b/module/branch/lang/en.php
index 6768fd3460..39c0e684ad 100644
--- a/module/branch/lang/en.php
+++ b/module/branch/lang/en.php
@@ -7,6 +7,7 @@ $lang->branch->add    = 'Add';
 
 $lang->branch->manageTitle = '%s Management';
 $lang->branch->all         = 'All ';
+$lang->branch->main        = 'Trunk';
 
 $lang->branch->id      = 'ID';
 $lang->branch->product = 'Product';
diff --git a/module/branch/lang/fr.php b/module/branch/lang/fr.php
index b06a97b3df..77af33535d 100644
--- a/module/branch/lang/fr.php
+++ b/module/branch/lang/fr.php
@@ -7,6 +7,7 @@ $lang->branch->add    = 'Ajout';
 
 $lang->branch->manageTitle = 'Gestion %s';
 $lang->branch->all         = 'Tous';
+$lang->branch->main        = 'Trunk';
 
 $lang->branch->id      = 'ID';
 $lang->branch->product = 'Product';
diff --git a/module/branch/lang/vi.php b/module/branch/lang/vi.php
index 8b1ef13d6a..249089736c 100644
--- a/module/branch/lang/vi.php
+++ b/module/branch/lang/vi.php
@@ -7,6 +7,7 @@ $lang->branch->add    = 'Thêm';
 
 $lang->branch->manageTitle = 'Quản lý %s';
 $lang->branch->all         = 'Tất cả ';
+$lang->branch->main        = 'Trunk';
 
 $lang->branch->id      = 'ID';
 $lang->branch->product = 'Sản phẩm';
diff --git a/module/branch/lang/zh-cn.php b/module/branch/lang/zh-cn.php
index f60eceeeb3..690f79c532 100644
--- a/module/branch/lang/zh-cn.php
+++ b/module/branch/lang/zh-cn.php
@@ -7,6 +7,7 @@ $lang->branch->add    = '添加';
 
 $lang->branch->manageTitle = '%s管理';
 $lang->branch->all         = '所有';
+$lang->branch->main        = '主干';
 
 $lang->branch->id      = '编号';
 $lang->branch->product = '所属产品';
diff --git a/module/branch/model.php b/module/branch/model.php
index 9e91f48fb7..ab0e5691f7 100644
--- a/module/branch/model.php
+++ b/module/branch/model.php
@@ -25,7 +25,7 @@ class branchModel extends model
             if(empty($productID)) $productID = $this->session->product;
             $product = $this->loadModel('product')->getById($productID);
             if(empty($product) or !isset($this->lang->product->branchName[$product->type])) return false;
-            return $this->lang->branch->all . $this->lang->product->branchName[$product->type];
+            return $this->lang->branch->main;
         }
         return htmlspecialchars_decode($this->dao->select('*')->from(TABLE_BRANCH)->where('id')->eq($branchID)->fetch('name'));
     }
@@ -52,7 +52,7 @@ class branchModel extends model
             $product = $this->loadModel('product')->getById($productID);
             if(!$product or $product->type == 'normal') return array();
 
-            $branches = array('0' => $this->lang->branch->all . $this->lang->product->branchName[$product->type]) + $branches;
+            $branches = array('0' => $this->lang->branch->main) + $branches;
         }
         return $branches;
     }
@@ -81,10 +81,7 @@ class branchModel extends model
             }
         }
 
-        if(strpos($params, 'noempty') === false)
-        {
-            $branchPairs = array('0' => $this->lang->branch->all . $this->lang->product->branchName['branch']) + $branchPairs;
-        }
+        if(strpos($params, 'noempty') === false) $branchPairs = array('0' => $this->lang->branch->main) + $branchPairs;
         return $branchPairs;
     }
 
@@ -154,7 +151,7 @@ class branchModel extends model
             if($product->type == 'normal') continue;
 
             if(!isset($branchGroups[$product->id]))  $branchGroups[$product->id] = array();
-            if(strpos($params, 'noempty') === false) $branchGroups[$product->id] = array('0' => $this->lang->branch->all . $this->lang->product->branchName[$product->type]) + $branchGroups[$product->id];
+            if(strpos($params, 'noempty') === false) $branchGroups[$product->id] = array('0' => $this->lang->branch->main) + $branchGroups[$product->id];
         }
 
         return $branchGroups;
diff --git a/module/bug/control.php b/module/bug/control.php
index ffd5a18765..63a3446018 100644
--- a/module/bug/control.php
+++ b/module/bug/control.php
@@ -1776,7 +1776,7 @@ class bug extends control
             $relatedTasks   = $this->dao->select('id, name')->from(TABLE_TASK)->where('id')->in($relatedTaskIdList)->fetchPairs();
             $relatedBugs    = $this->dao->select('id, title')->from(TABLE_BUG)->where('id')->in($relatedBugIdList)->fetchPairs();
             $relatedCases   = $this->dao->select('id, title')->from(TABLE_CASE)->where('id')->in($relatedCaseIdList)->fetchPairs();
-            $relatedBranch  = array('0' => $this->lang->branch->all) + $this->dao->select('id, name')->from(TABLE_BRANCH)->where('id')->in($relatedBranchIdList)->fetchPairs();
+            $relatedBranch  = array('0' => $this->lang->branch->main) + $this->dao->select('id, name')->from(TABLE_BRANCH)->where('id')->in($relatedBranchIdList)->fetchPairs();
             $relatedBuilds  = array('trunk' => $this->lang->trunk) + $this->dao->select('id, name')->from(TABLE_BUILD)->where('id')->in($relatedBuildIdList)->fetchPairs();
             $relatedFiles   = $this->dao->select('id, objectID, pathname, title')->from(TABLE_FILE)->where('objectType')->eq('bug')->andWhere('objectID')->in(@array_keys($bugs))->andWhere('extra')->ne('editor')->fetchGroup('objectID');
             $relatedModules = $this->loadModel('tree')->getAllModulePairs('bug');
diff --git a/module/bug/model.php b/module/bug/model.php
index cfe3c1200e..17318e9d63 100644
--- a/module/bug/model.php
+++ b/module/bug/model.php
@@ -1320,7 +1320,7 @@ class bugModel extends model
         else
         {
             $this->config->bug->search['fields']['branch'] = $this->lang->product->branch;
-            $this->config->bug->search['params']['branch']['values']  = array('' => '') + $this->loadModel('branch')->getPairs($productID, 'noempty') + array('all' => $this->lang->branch->all);
+            $this->config->bug->search['params']['branch']['values']  = array('' => '', 0 => $this->lang->branch->main) + $this->loadModel('branch')->getPairs($productID, 'noempty') + array('all' => $this->lang->branch->all);
         }
 
         $this->loadModel('search')->setSearchParams($this->config->bug->search);
diff --git a/module/common/lang/en.php b/module/common/lang/en.php
index 089c0c4521..b26a53028d 100644
--- a/module/common/lang/en.php
+++ b/module/common/lang/en.php
@@ -402,18 +402,19 @@ $lang->pasteImgFail       = "Failed to paste images. Try again later.";
 $lang->pasteImgUploading  = "Uploading...";
 
 /* Time formats settings. */
-if(!defined('DT_DATETIME1')) define('DT_DATETIME1',  'Y-m-d H:i:s');
-if(!defined('DT_DATETIME2')) define('DT_DATETIME2',  'y-m-d H:i');
-if(!defined('DT_MONTHTIME1'))define('DT_MONTHTIME1', 'n/d H:i');
-if(!defined('DT_MONTHTIME2'))define('DT_MONTHTIME2', 'n/d H:i');
-if(!defined('DT_DATE1'))     define('DT_DATE1',     'Y-m-d');
-if(!defined('DT_DATE2'))     define('DT_DATE2',     'Ymd');
-if(!defined('DT_DATE3'))     define('DT_DATE3',     'Y/m/d');
-if(!defined('DT_DATE4'))     define('DT_DATE4',     'M d');
-if(!defined('DT_DATE5'))     define('DT_DATE5',     'j/n');
-if(!defined('DT_TIME1'))     define('DT_TIME1',     'H:i:s');
-if(!defined('DT_TIME2'))     define('DT_TIME2',     'H:i');
-if(!defined('LONG_TIME'))    define('LONG_TIME',    '2059-12-31');
+if(!defined('DT_DATETIME1'))  define('DT_DATETIME1',  'Y-m-d H:i:s');
+if(!defined('DT_DATETIME2'))  define('DT_DATETIME2',  'y-m-d H:i');
+if(!defined('DT_MONTHTIME1')) define('DT_MONTHTIME1', 'n/d H:i');
+if(!defined('DT_MONTHTIME2')) define('DT_MONTHTIME2', 'n/d H:i');
+if(!defined('DT_DATE1'))      define('DT_DATE1',     'Y-m-d');
+if(!defined('DT_DATE2'))      define('DT_DATE2',     'Ymd');
+if(!defined('DT_DATE3'))      define('DT_DATE3',     'Y/m/d');
+if(!defined('DT_DATE4'))      define('DT_DATE4',     'M d');
+if(!defined('DT_DATE5'))      define('DT_DATE5',     'j/n');
+if(!defined('DT_TIME1'))      define('DT_TIME1',     'H:i:s');
+if(!defined('DT_TIME2'))      define('DT_TIME2',     'H:i');
+if(!defined('LONG_TIME'))     define('LONG_TIME',    '2059-12-31');
+if(!defined('MAIN'))          define('MAIN', '0');
 
 /* Datepicker. */
 $lang->datepicker = new stdclass();
diff --git a/module/common/lang/zh-cn.php b/module/common/lang/zh-cn.php
index 59b4a7c9c2..30aed1d98d 100644
--- a/module/common/lang/zh-cn.php
+++ b/module/common/lang/zh-cn.php
@@ -402,18 +402,19 @@ $lang->pasteImgFail      = "贴图失败，请稍后重试。";
 $lang->pasteImgUploading = "正在上传图片，请稍后...";
 
 /* 时间格式设置。*/
-if(!defined('DT_DATETIME1')) define('DT_DATETIME1', 'Y-m-d H:i:s');
-if(!defined('DT_DATETIME2')) define('DT_DATETIME2', 'y-m-d H:i');
+if(!defined('DT_DATETIME1'))  define('DT_DATETIME1', 'Y-m-d H:i:s');
+if(!defined('DT_DATETIME2'))  define('DT_DATETIME2', 'y-m-d H:i');
 if(!defined('DT_MONTHTIME1')) define('DT_MONTHTIME1', 'n/d H:i');
 if(!defined('DT_MONTHTIME2')) define('DT_MONTHTIME2', 'n月d日 H:i');
-if(!defined('DT_DATE1')) define('DT_DATE1', 'Y-m-d');
-if(!defined('DT_DATE2')) define('DT_DATE2', 'Ymd');
-if(!defined('DT_DATE3')) define('DT_DATE3', 'Y年m月d日');
-if(!defined('DT_DATE4')) define('DT_DATE4', 'n月j日');
-if(!defined('DT_DATE5')) define('DT_DATE5', 'j/n');
-if(!defined('DT_TIME1')) define('DT_TIME1', 'H:i:s');
-if(!defined('DT_TIME2')) define('DT_TIME2', 'H:i');
-if(!defined('LONG_TIME')) define('LONG_TIME', '2059-12-31');
+if(!defined('DT_DATE1'))      define('DT_DATE1', 'Y-m-d');
+if(!defined('DT_DATE2'))      define('DT_DATE2', 'Ymd');
+if(!defined('DT_DATE3'))      define('DT_DATE3', 'Y年m月d日');
+if(!defined('DT_DATE4'))      define('DT_DATE4', 'n月j日');
+if(!defined('DT_DATE5'))      define('DT_DATE5', 'j/n');
+if(!defined('DT_TIME1'))      define('DT_TIME1', 'H:i:s');
+if(!defined('DT_TIME2'))      define('DT_TIME2', 'H:i');
+if(!defined('LONG_TIME'))     define('LONG_TIME', '2059-12-31');
+if(!defined('MAIN'))          define('MAIN', '0');
 
 /* datepicker 时间*/
 $lang->datepicker = new stdclass();
diff --git a/module/product/model.php b/module/product/model.php
index c711eac417..96739eacc5 100644
--- a/module/product/model.php
+++ b/module/product/model.php
@@ -858,7 +858,7 @@ class productModel extends model
         else
         {
             $this->config->product->search['fields']['branch'] = $this->lang->product->branch;
-            $this->config->product->search['params']['branch']['values']  = array('' => '') + $this->loadModel('branch')->getPairs($productID, 'noempty') + array('all' => $this->lang->branch->all);
+            $this->config->product->search['params']['branch']['values']  = array('' => '', '0' => $this->lang->branch->main) + $this->loadModel('branch')->getPairs($productID, 'noempty') + array('all' => $this->lang->branch->all);
         }
 
         $this->loadModel('search')->setSearchParams($this->config->product->search);
diff --git a/module/productplan/model.php b/module/productplan/model.php
index 76cabb9a9f..ff97b370d4 100644
--- a/module/productplan/model.php
+++ b/module/productplan/model.php
@@ -275,6 +275,24 @@ class productplanModel extends model
         return array('' => '') + $planPairs;
     }
 
+    /**
+     * Get plan list by story id list.
+     *
+     * @param  string|array $storyIdList
+     * @access public
+     * @return array
+     */
+    public function getListByStories($storyIdList)
+    {
+        if(empty($storyIdList)) return array();
+        return $this->dao->select('t3.*, t1.id as storyID')->from(TABLE_STORY)->alias('t1')
+            ->leftJoin(TABLE_PLANSTORY)->alias('t2')->on('t1.id=t2.story')
+            ->leftJoin(TABLE_PRODUCTPLAN)->alias('t3')->on('t2.plan=t3.id')
+            ->where('t1.id')->in($storyIdList)
+            ->andWhere('t3.deleted')->eq(0)
+            ->fetchGroup('storyID', 'id');
+    }
+
     /**
      * Get plans for products
      *
diff --git a/module/story/control.php b/module/story/control.php
index 2723bd9b80..c86ebcea53 100644
--- a/module/story/control.php
+++ b/module/story/control.php
@@ -1381,7 +1381,55 @@ class story extends control
      */
     public function batchChangeBranch($branchID)
     {
-        $storyIdList = !empty($_POST['storyIdList']) ? $this->post->storyIdList : die(js::locate($this->session->storyList, 'parent'));
+        /* Get the storyIdList value from the post. */
+        if(!empty($_POST['storyIdList'])) $storyIdList = $_POST['storyIdList'];
+        $storyIdList = $storyIdList ? $storyIdList : die(js::locate($this->session->storyList, 'parent'));
+        $plans       = $this->loadModel('productplan')->getListByStories($storyIdList);
+        if(empty($confirm))
+        {
+            $stories             = $this->story->getByList($storyIdList);
+            $conflictStotyIdList = '';
+            $normalStotyIdList   = '';
+            /* Determine whether there are conflicting stories. */
+            foreach($storyIdList as $storyID)
+            {
+                /* If the story of a non-trunk branch needs to be changed to a non-trunk branch, judge whether there is a conflict in the plan. */
+                if($branchID and $stories[$storyID]->branch and $stories[$storyID]->branch != $branchID and isset($plans[$storyID]))
+                {
+                    if(!empty($plan->branch) and $plan->branch != $branchID)
+                    {
+                        $conflictStotyIdList .= '[' . $storyID . ']';
+                        break;
+                    }
+                }
+                /* If a trunk story needs to be switched to a non-trunk branch to determine whether there is a conflicting plan. */
+                elseif($branchID and empty($stories[$storyID]->branch) and $plans[$storyID])
+                {
+                    foreach($plans[$storyID] as $plan)
+                    {
+                        if(!empty($plan->branch) and $plan->branch != $branchID)
+                        {
+                            $conflictStotyIdList .= '[' . $storyID . ']';
+                            break;
+                        }
+                    }
+                }
+                else
+                {
+                    $normalStotyIdList .= $storyID . ',';
+                }
+            }
+
+            if($conflictStotyIdList)
+            {
+                $storyIdList = implode(',', $storyIdList);
+                $confirmURL  = $this->createLink('story', 'batchChangeBranch', "branchID=$branchID&confirm=yes&storyIdList=$storyIdList");
+                $cancelURL   = $this->createLink('story', 'batchChangeBranch', "branchID=$branchID&confirm=no&storyIdList=$normalStotyIdList");
+                die(js::confirm(sprintf($this->lang->story->confirmChangeBranch, $conflictStotyIdList), $confirmURL, $cancelURL));
+            }
+        }
+
+        if(!is_array($storyIdList)) $storyIdList = explode(',', $storyIdList);
         $storyIdList = array_unique($storyIdList);
         $allChanges  = $this->story->batchChangeBranch($storyIdList, $branchID);
         if(dao::isError()) die(js::error(dao::getError()));
@@ -2039,7 +2087,7 @@ class story extends control
             $relatedStories = $this->dao->select('id,title')->from(TABLE_STORY) ->where('id')->in($relatedStoryIdList)->fetchPairs();
             $relatedFiles   = $this->dao->select('id, objectID, pathname, title')->from(TABLE_FILE)->where('objectType')->eq('story')->andWhere('objectID')->in($storyIdList)->andWhere('extra')->ne('editor')->fetchGroup('objectID');
             $relatedSpecs   = $this->dao->select('*')->from(TABLE_STORYSPEC)->where('`story`')->in($storyIdList)->orderBy('version desc')->fetchGroup('story');
-            $relatedBranch  = array('0' => $this->lang->branch->all) + $this->dao->select('id, name')->from(TABLE_BRANCH)->where('id')->in($relatedBranchIdList)->fetchPairs();
+            $relatedBranch  = array('0' => $this->lang->branch->main) + $this->dao->select('id, name')->from(TABLE_BRANCH)->where('id')->in($relatedBranchIdList)->fetchPairs();
             $relatedModules = $this->loadModel('tree')->getAllModulePairs();
 
             foreach($stories as $story)
diff --git a/module/story/model.php b/module/story/model.php
index 25a49f5c07..5136d1dff6 100644
--- a/module/story/model.php
+++ b/module/story/model.php
@@ -1692,7 +1692,44 @@ class storyModel extends model
             $story->branch         = $branchID;
 
             $this->dao->update(TABLE_STORY)->data($story)->autoCheck()->where('id')->eq((int)$storyID)->exec();
-            if(!dao::isError()) $allChanges[$storyID] = common::createChanges($oldStory, $story);
+            if(!dao::isError())
+            {
+                /* If a trunk story to be switched to a non-trunk branch to cancel the association with other non-trunk branch plans. */
+                $removeUnlinkPlan = '';
+                $continueLinkPlan = '';
+                if(empty($oldStory->branch) and $branchID and isset($plans[$storyID]))
+                {
+                    foreach($plans[$storyID] as $planID => $plan)
+                    {
+                        if(!empty($plan->branch) and $plan->branch != $branchID)
+                        {
+                            $removeUnlinkPlan = $planID . ',';
+                            continue;
+                        }
+                        $continueLinkPlan = $planID . ',';
+                    }
+                }
+                /* If a non-trunk story wants to switch to a non-trunk branch, cancel the association with other non-trunk branch plans. */
+                elseif($oldStory->branch and $branchID and isset($plans[$storyID]))
+                {
+                    foreach($plans[$storyID] as $planID => $plan)
+                    {
+                        if(!empty($plan->branch) and $plan->branch != $branchID)
+                        {
+                            $removeUnlinkPlan = $planID . ',';
+                            continue;
+                        }
+                        $continueLinkPlan = $planID . ',';
+                    }
+                }
+                if($removeUnlinkPlan) $this->dao->delete()->from(TABLE_PLANSTORY)->where('story')->eq($storyID)->andWhere('plan')->in($removeUnlinkPlan)->exec();
+                if($continueLinkPlan)
+                {
+                    $story->plan = $continueLinkPlan;
+                    $this->dao->update(TABLE_STORY)->set('plan')->eq($continueLinkPlan)->where('id')->eq($storyID)->exec();
+                }
+                $allChanges[$storyID] = common::createChanges($oldStory, $story);
+            }
         }
         return $allChanges;
     }
@@ -2413,6 +2450,7 @@ class storyModel extends model
         $storyQuery = $storyQuery . ' AND `product` ' . helper::dbIN(array_keys($products));
         if($excludeStories) $storyQuery = $storyQuery . ' AND `id` NOT ' . helper::dbIN($excludeStories);
         if($this->app->moduleName == 'productplan') $storyQuery .= " AND `status` NOT IN ('closed') AND `parent` >= 0 ";
+        $allBranch = "`branch` = 'all'";
         if($executionID != '')
         {
             foreach($products as $product) $branches[$product->branch] = $product->branch;
@@ -2430,9 +2468,11 @@ class storyModel extends model
         }
         elseif($branch)
         {
-            $allBranch = "`branch` = 'all'";
             if($branch and strpos($storyQuery, '`branch` =') === false) $storyQuery .= " AND `branch` in('0','$branch')";
-            if(strpos($storyQuery, $allBranch) !== false) $storyQuery = str_replace($allBranch, '1', $storyQuery);
+        }
+        elseif(strpos($storyQuery, $allBranch) !== false)
+        {
+            $storyQuery = str_replace($allBranch, '1', $storyQuery);
         }
         $storyQuery = preg_replace("/`plan` +LIKE +'%([0-9]+)%'/i", "CONCAT(',', `plan`, ',') LIKE '%,$1,%'", $storyQuery);
 
diff --git a/module/testcase/model.php b/module/testcase/model.php
index 6da824b03d..12a3fdd97c 100644
--- a/module/testcase/model.php
+++ b/module/testcase/model.php
@@ -1439,7 +1439,7 @@ class testcaseModel extends model
         else
         {
             $this->config->testcase->search['fields']['branch'] = $this->lang->product->branch;
-            $this->config->testcase->search['params']['branch']['values'] = array('' => '') + $this->loadModel('branch')->getPairs($productID, 'noempty') + array('all' => $this->lang->branch->all);
+            $this->config->testcase->search['params']['branch']['values'] = array('' => '', '0' => $this->lang->branch->main) + $this->loadModel('branch')->getPairs($productID, 'noempty') + array('all' => $this->lang->branch->all);
         }
         if(!$this->config->testcase->needReview) unset($this->config->testcase->search['params']['status']['values']['wait']);
         $this->config->testcase->search['actionURL'] = $actionURL;
diff --git a/module/testsuite/model.php b/module/testsuite/model.php
index c610a4d56a..360314084a 100644
--- a/module/testsuite/model.php
+++ b/module/testsuite/model.php
@@ -42,7 +42,7 @@ class testsuiteModel extends model
         if($currentProduct->type != 'normal')
         {
             $this->app->loadLang('branch');
-            $branchName = $this->lang->branch->all . $this->lang->product->branchName[$currentProduct->type];
+            $branchName = $this->lang->branch->main;
             $output .= "<div class='btn-group'><button id='currentBranch' type='button' class='btn btn-limit'>{$branchName} </button></div></div>";
         }
         $output .= '</div>';