diff --git a/db/update21.6.sql b/db/update21.6.sql
new file mode 100644
index 0000000000..22ecc60268
--- /dev/null
+++ b/db/update21.6.sql
@@ -0,0 +1,2 @@
+ALTER TABLE `zt_relationoftasks` ADD COLUMN `project` mediumint(8) unsigned NOT NULL DEFAULT 0 AFTER `id`;
+ALTER TABLE `zt_relationoftasks` MODIFY `execution` char(30) NOT NULL DEFAULT '' AFTER `project`;
diff --git a/lib/zin/wg/backbtn/v1.php b/lib/zin/wg/backbtn/v1.php
index 6a451e756a..5b20fca7ac 100644
--- a/lib/zin/wg/backbtn/v1.php
+++ b/lib/zin/wg/backbtn/v1.php
@@ -74,7 +74,7 @@ class backBtn extends btn
             'zanode'         => 'zanode-browse,zanode-view',
             'zahost'         => 'zahost-browse,zahost-view',
             'stakeholder'    => 'stakeholder-browse,program-stakeholder',
-            'execution'      => 'execution-story,execution-team,execution-index,execution->view,project-execution,execution-all,project-index,user-execution,execution-relation',
+            'execution'      => 'execution-story,execution-team,execution-index,execution->view,project-execution,execution-all,project-index,user-execution,execution-relation,programplan-relation',
             'ai'             => 'ai-models',
             'api'            => 'api-index',
             'demand'         => 'demand-browse,demand-view,my-work,my-contribute,feedback-adminview,feedback-admin,my-index,demandpool-track,product-dynamic',
diff --git a/module/group/lang/de.php b/module/group/lang/de.php
index e23baa9c0d..c5242f8351 100644
--- a/module/group/lang/de.php
+++ b/module/group/lang/de.php
@@ -525,6 +525,7 @@ $lang->group->package->deleteProjectRelease  = 'Delete Project Release';
 $lang->group->package->importProjectRelease  = 'Import Project Release';
 $lang->group->package->projectReleaseNotify  = 'Project Release Notify';
 $lang->group->package->gantt                 = 'Gantt';
+$lang->group->package->projectRelation       = 'Project Relation';
 $lang->group->package->executionRelation     = 'Execution Relation';
 $lang->group->package->browseBuild           = 'Browse Build';
 $lang->group->package->browseExecutionStory  = 'Browse Execution Story';
diff --git a/module/group/lang/en.php b/module/group/lang/en.php
index 7358762bd9..0077e8d7b3 100644
--- a/module/group/lang/en.php
+++ b/module/group/lang/en.php
@@ -525,6 +525,7 @@ $lang->group->package->deleteProjectRelease  = 'Delete Project Release';
 $lang->group->package->importProjectRelease  = 'Import Project Release';
 $lang->group->package->projectReleaseNotify  = 'Project Release Notify';
 $lang->group->package->gantt                 = 'Gantt';
+$lang->group->package->projectRelation       = 'Project Relation';
 $lang->group->package->executionRelation     = 'Execution Relation';
 $lang->group->package->browseBuild           = 'Browse Build';
 $lang->group->package->browseExecutionStory  = 'Browse Execution Story';
diff --git a/module/group/lang/fr.php b/module/group/lang/fr.php
index 7e454bb8ac..8b10db5e55 100644
--- a/module/group/lang/fr.php
+++ b/module/group/lang/fr.php
@@ -525,6 +525,7 @@ $lang->group->package->deleteProjectRelease  = 'Delete Project Release';
 $lang->group->package->importProjectRelease  = 'Import Project Release';
 $lang->group->package->projectReleaseNotify  = 'Project Release Notify';
 $lang->group->package->gantt                 = 'Gantt';
+$lang->group->package->projectRelation       = 'Project Relation';
 $lang->group->package->executionRelation     = 'Execution Relation';
 $lang->group->package->browseBuild           = 'Browse Build';
 $lang->group->package->browseExecutionStory  = 'Browse Execution Story';
diff --git a/module/group/lang/zh-cn.php b/module/group/lang/zh-cn.php
index 7ecf353b7d..91b990594b 100644
--- a/module/group/lang/zh-cn.php
+++ b/module/group/lang/zh-cn.php
@@ -525,6 +525,7 @@ $lang->group->package->deleteProjectRelease  = '删除项目发布';
 $lang->group->package->importProjectRelease  = '导入导出项目发布';
 $lang->group->package->projectReleaseNotify  = '项目发布通知';
 $lang->group->package->gantt                 = '阶段甘特图';
+$lang->group->package->projectRelation       = '维护任务关系';
 $lang->group->package->executionRelation     = '维护任务关系';
 $lang->group->package->browseBuild           = '浏览构建';
 $lang->group->package->browseExecutionStory  = '浏览执行研发需求';
diff --git a/module/group/packagemanager.php b/module/group/packagemanager.php
index 6451aed510..cd86ce98f9 100644
--- a/module/group/packagemanager.php
+++ b/module/group/packagemanager.php
@@ -3338,7 +3338,17 @@ $config->group->package->gantt->subset = 'programplan';
 $config->group->package->gantt->privs  = array();
 $config->group->package->gantt->privs['programplan-browse']    = array('edition' => 'max,ipd', 'vision' => 'rnd', 'order' => 15, 'depend' => array('project-index'), 'recommend' => array('programplan-ganttEdit'));
 $config->group->package->gantt->privs['programplan-ganttEdit'] = array('edition' => 'max,ipd', 'vision' => 'rnd', 'order' => 20, 'depend' => array('programplan-browse'), 'recommend' => array());
-$config->group->package->gantt->privs['programplan-relation']  = array('edition' => 'max,ipd', 'vision' => 'rnd', 'order' => 20, 'depend' => array('programplan-browse'), 'recommend' => array());
+
+$config->group->package->projectRelation = new stdclass();
+$config->group->package->projectRelation->order  = 10;
+$config->group->package->projectRelation->subset = 'programplan';
+$config->group->package->projectRelation->privs  = array();
+$config->group->package->projectRelation->privs['programplan-relation']            = array('edition' => 'max,ipd', 'vision' => 'rnd', 'order' => 1, 'depend' => array('programplan-browse'), 'recommend' => array('programplan-createrelation', 'programplan-editrelation', 'programplan-batcheditrelation', 'programplan-deleterelation', 'programplan-batchdeleterelation'));
+$config->group->package->projectRelation->privs['programplan-createrelation']      = array('edition' => 'max,ipd', 'vision' => 'rnd', 'order' => 2, 'depend' => array('programplan-browse', 'programplan-relation'), 'recommend' => array());
+$config->group->package->projectRelation->privs['programplan-editrelation']        = array('edition' => 'max,ipd', 'vision' => 'rnd', 'order' => 3, 'depend' => array('programplan-browse', 'programplan-relation'), 'recommend' => array());
+$config->group->package->projectRelation->privs['programplan-batcheditrelation']   = array('edition' => 'max,ipd', 'vision' => 'rnd', 'order' => 4, 'depend' => array('programplan-browse', 'programplan-relation'), 'recommend' => array());
+$config->group->package->projectRelation->privs['programplan-deleterelation']      = array('edition' => 'max,ipd', 'vision' => 'rnd', 'order' => 5, 'depend' => array('programplan-browse', 'programplan-relation'), 'recommend' => array());
+$config->group->package->projectRelation->privs['programplan-batchdeleterelation'] = array('edition' => 'max,ipd', 'vision' => 'rnd', 'order' => 6, 'depend' => array('programplan-browse', 'programplan-relation'), 'recommend' => array());
 
 $config->group->package->executionRelation = new stdclass();
 $config->group->package->executionRelation->order  = 10;
diff --git a/module/programplan/control.php b/module/programplan/control.php
index dcdbff7bdf..1dcd69db1e 100644
--- a/module/programplan/control.php
+++ b/module/programplan/control.php
@@ -310,7 +310,7 @@ class programplan extends control
     }
 
     /**
-     * 展示项目的任务关系列表。
+     * 项目下维护任务关系。
      * Show relation of project.
      *
      * @param  int    $projectID
@@ -324,4 +324,74 @@ class programplan extends control
     {
         echo $this->fetch('execution', 'relation', "executionID=$projectID&recTotal=$recTotal&recPerPage=$recPerPage&pageID=$pageID");
     }
+
+    /**
+     * 项目下创建任务关系。
+     * Create relation of project.
+     *
+     * @param  int    $projectID
+     * @access public
+     * @return void
+     */
+    public function createRelation(int $projectID = 0)
+    {
+        echo $this->fetch('execution', 'createRelation', "executionID=$projectID");
+    }
+
+    /**
+     * 项目下编辑任务关系。
+     * Edit relation of project.
+     *
+     * @param  int    $relationID
+     * @param  int    $projectID
+     * @access public
+     * @return void
+     */
+    public function editRelation(int $relationID, int $projectID = 0)
+    {
+        echo $this->fetch('execution', 'editRelation', "relationID=$relationID&projectID=$projectID&executionID=0");
+    }
+
+    /**
+     * 项目下批量编辑任务关系。
+     * Batch edit relations of project.
+     *
+     * @param  int    $projectID
+     * @access public
+     * @return void
+     */
+    public function batchEditRelation(int $projectID = 0)
+    {
+        echo $this->fetch('execution', 'batchEditRelation', "projectID=$projectID&executionID=0");
+    }
+
+    /**
+     * 项目下删除任务关系。
+     * Delete relation of project.
+     *
+     * @param  int    $id
+     * @param  int    $projectID
+     * @access public
+     * @return void
+     */
+    public function deleteRelation(int $relationID, int $projectID)
+    {
+        $this->loadModel('execution')->deleteRelation($relationID);
+        return $this->sendSuccess(array('load' => inlink('relation', "project=$projectID")));
+    }
+
+    /**
+     * 项目下批量删除任务关系。
+     * Batch delete relations of project.
+     *
+     * @param  int    $executionID
+     * @access public
+     * @return void
+     */
+    public function batchDeleteRelation(int $projectID)
+    {
+        $this->loadModel('execution');
+        foreach($this->post->relationIdList as $relationID) $this->execution->deleteRelation($relationID);
+        return $this->sendSuccess(array('load' => inlink('relation', "projectID=$projectID")));
+    }
 }
diff --git a/module/programplan/lang/de.php b/module/programplan/lang/de.php
index 52875037a8..4c7f7122ad 100644
--- a/module/programplan/lang/de.php
+++ b/module/programplan/lang/de.php
@@ -73,7 +73,13 @@ $lang->programplan->wait             = 'Wait';
 $lang->programplan->enabled          = 'Enabling Stage';
 $lang->programplan->point            = 'Review Point';
 $lang->programplan->progress         = 'Progress';
-$lang->programplan->setTaskRelation  = 'Manage Relation';
+
+$lang->programplan->setTaskRelation     = 'Manage Task Relation';
+$lang->programplan->createRelation      = 'Create Task Relation';
+$lang->programplan->editRelation        = 'Manage Task Relation';
+$lang->programplan->batchEditRelation   = 'Batch Manage Task Relation';
+$lang->programplan->deleteRelation      = 'Delete Relation';
+$lang->programplan->batchDeleteRelation = 'Batch Delete Relation';
 
 $lang->programplan->errorBegin       = "{$lang->projectCommon} begin date: %s, begin date should be >= {$lang->projectCommon} begin date.";
 $lang->programplan->errorEnd         = "{$lang->projectCommon} end date: %s, end date should be <= {$lang->projectCommon} end date.";
diff --git a/module/programplan/lang/en.php b/module/programplan/lang/en.php
index 351cc2267f..d71fc02238 100644
--- a/module/programplan/lang/en.php
+++ b/module/programplan/lang/en.php
@@ -73,7 +73,13 @@ $lang->programplan->wait             = 'Wait';
 $lang->programplan->enabled          = 'Enabling Stage';
 $lang->programplan->point            = 'Review Point';
 $lang->programplan->progress         = 'Progress';
-$lang->programplan->setTaskRelation  = 'Manage Relation';
+
+$lang->programplan->setTaskRelation     = 'Manage Task Relation';
+$lang->programplan->createRelation      = 'Create Task Relation';
+$lang->programplan->editRelation        = 'Manage Task Relation';
+$lang->programplan->batchEditRelation   = 'Batch Manage Task Relation';
+$lang->programplan->deleteRelation      = 'Delete Relation';
+$lang->programplan->batchDeleteRelation = 'Batch Delete Relation';
 
 $lang->programplan->errorBegin       = "{$lang->projectCommon} begin date: %s, begin date should be >= {$lang->projectCommon} begin date.";
 $lang->programplan->errorEnd         = "{$lang->projectCommon} end date: %s, end date should be <= {$lang->projectCommon} end date.";
diff --git a/module/programplan/lang/fr.php b/module/programplan/lang/fr.php
index 52875037a8..4c7f7122ad 100644
--- a/module/programplan/lang/fr.php
+++ b/module/programplan/lang/fr.php
@@ -73,7 +73,13 @@ $lang->programplan->wait             = 'Wait';
 $lang->programplan->enabled          = 'Enabling Stage';
 $lang->programplan->point            = 'Review Point';
 $lang->programplan->progress         = 'Progress';
-$lang->programplan->setTaskRelation  = 'Manage Relation';
+
+$lang->programplan->setTaskRelation     = 'Manage Task Relation';
+$lang->programplan->createRelation      = 'Create Task Relation';
+$lang->programplan->editRelation        = 'Manage Task Relation';
+$lang->programplan->batchEditRelation   = 'Batch Manage Task Relation';
+$lang->programplan->deleteRelation      = 'Delete Relation';
+$lang->programplan->batchDeleteRelation = 'Batch Delete Relation';
 
 $lang->programplan->errorBegin       = "{$lang->projectCommon} begin date: %s, begin date should be >= {$lang->projectCommon} begin date.";
 $lang->programplan->errorEnd         = "{$lang->projectCommon} end date: %s, end date should be <= {$lang->projectCommon} end date.";
diff --git a/module/programplan/lang/zh-cn.php b/module/programplan/lang/zh-cn.php
index cfe0f02127..542c9212b9 100644
--- a/module/programplan/lang/zh-cn.php
+++ b/module/programplan/lang/zh-cn.php
@@ -73,7 +73,13 @@ $lang->programplan->wait             = '待提交';
 $lang->programplan->enabled          = '启用阶段';
 $lang->programplan->point            = '评审点';
 $lang->programplan->progress         = '进度';
-$lang->programplan->setTaskRelation  = '维护任务关系';
+
+$lang->programplan->setTaskRelation     = '维护任务关系';
+$lang->programplan->createRelation      = '添加任务关系';
+$lang->programplan->editRelation        = '维护任务关系';
+$lang->programplan->batchEditRelation   = '批量维护任务关系';
+$lang->programplan->deleteRelation      = '删除任务关系';
+$lang->programplan->batchDeleteRelation = '批量删除任务关系';
 
 $lang->programplan->errorBegin       = "阶段的开始时间不能小于所属{$lang->projectCommon}的开始时间%s";
 $lang->programplan->errorEnd         = "阶段的结束时间不能大于所属{$lang->projectCommon}的结束时间%s";
diff --git a/module/task/model.php b/module/task/model.php
index e7dead3091..1637c4a62e 100755
--- a/module/task/model.php
+++ b/module/task/model.php
@@ -1792,6 +1792,35 @@ class taskModel extends model
         return $taskPairs;
     }
 
+    /**
+     * 获取项目下的任务列表。
+     * Get project task list.
+     *
+     * @param  int    $projectID
+     * @param  bool   $isPairs
+     * @access public
+     * @return array
+     */
+    public function getProjectTaskList($projectID, $isPairs = false)
+    {
+        $taskList = $this->dao->select('*')->from(TABLE_TASK)
+            ->where('deleted')->eq(0)
+            ->beginIF($this->config->vision)->andWhere('vision')->eq($this->config->vision)->fi()
+            ->andWhere('project')->eq($projectID)
+            ->beginIF(!$this->app->user->admin)->andWhere('execution')->in($this->app->user->view->sprints)->fi()
+            ->fetchAll('id');
+
+        $taskPairs = array();
+        foreach($taskList as $taskID => $task)
+        {
+            $prefix             = $task->parent > 0 ? "[{$this->lang->task->childrenAB}] " : '';
+            $task->name         = $prefix . "$task->id:" . (empty($task->finishedByRealName) ? '' : "$task->finishedByRealName:") . "$task->name";
+            $taskPairs[$taskID] = $task->name;
+        }
+
+        return $isPairs ? $taskPairs : $taskList;
+    }
+
     /**
      * 获取导出的任务数据。
      * Get export task information.