diff --git a/module/group/packagemanager.php b/module/group/packagemanager.php
index 72f427ded5..6451aed510 100644
--- a/module/group/packagemanager.php
+++ b/module/group/packagemanager.php
@@ -3338,6 +3338,7 @@ $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->executionRelation = new stdclass();
 $config->group->package->executionRelation->order  = 10;
diff --git a/module/programplan/control.php b/module/programplan/control.php
index 5cb9ba796f..caabc45178 100644
--- a/module/programplan/control.php
+++ b/module/programplan/control.php
@@ -308,4 +308,19 @@ class programplan extends control
         $stageAttribute = $this->programplan->getStageAttribute($stageID);
         return print($stageAttribute);
     }
+
+    /**
+     * Show relation of project.
+     *
+     * @param  int    $projectID
+     * @param  int    $recTotal
+     * @param  int    $recPerPage
+     * @param  int    $pageID
+     * @access public
+     * @return void
+     */
+    public function relation(int $projectID = 0, int $recTotal = 0, int $recPerPage = 25, int $pageID = 1)
+    {
+        echo $this->fetch('execution', 'relation', "executionID=$projectID&recTotal=$recTotal&recPerPage=$recPerPage&pageID=$pageID");
+    }
 }
diff --git a/module/programplan/lang/de.php b/module/programplan/lang/de.php
index 51f5eb2843..52875037a8 100644
--- a/module/programplan/lang/de.php
+++ b/module/programplan/lang/de.php
@@ -73,6 +73,7 @@ $lang->programplan->wait             = 'Wait';
 $lang->programplan->enabled          = 'Enabling Stage';
 $lang->programplan->point            = 'Review Point';
 $lang->programplan->progress         = 'Progress';
+$lang->programplan->setTaskRelation  = 'Manage Relation';
 
 $lang->programplan->errorBegin       = "{$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 ee25e75353..351cc2267f 100644
--- a/module/programplan/lang/en.php
+++ b/module/programplan/lang/en.php
@@ -73,6 +73,7 @@ $lang->programplan->wait             = 'Wait';
 $lang->programplan->enabled          = 'Enabling Stage';
 $lang->programplan->point            = 'Review Point';
 $lang->programplan->progress         = 'Progress';
+$lang->programplan->setTaskRelation  = 'Manage Relation';
 
 $lang->programplan->errorBegin       = "{$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 51f5eb2843..52875037a8 100644
--- a/module/programplan/lang/fr.php
+++ b/module/programplan/lang/fr.php
@@ -73,6 +73,7 @@ $lang->programplan->wait             = 'Wait';
 $lang->programplan->enabled          = 'Enabling Stage';
 $lang->programplan->point            = 'Review Point';
 $lang->programplan->progress         = 'Progress';
+$lang->programplan->setTaskRelation  = 'Manage Relation';
 
 $lang->programplan->errorBegin       = "{$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 e3fcb5150e..cfe0f02127 100644
--- a/module/programplan/lang/zh-cn.php
+++ b/module/programplan/lang/zh-cn.php
@@ -73,6 +73,7 @@ $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';
 
 $lang->programplan->errorBegin       = "阶段的开始时间不能小于所属{$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/programplan/ui/gantt.html.php b/module/programplan/ui/gantt.html.php
index 859543a84b..6f5db28a1d 100644
--- a/module/programplan/ui/gantt.html.php
+++ b/module/programplan/ui/gantt.html.php
@@ -54,6 +54,7 @@ if($app->rawModule == 'programplan')
             ))
         ),
         btn(set::url($this->createLink('programplan', 'ajaxcustom')), set::icon('cog-outline'), $lang->settings, setClass('no-underline'), set::type('link'), set('data-toggle', 'modal'), set('data-size', 'sm')),
+        btn(set::url($this->createLink('programplan', 'relation', "projectID={$projectID}")), set::icon('list-alt'), $lang->programplan->setTaskRelation, setClass('no-underline'), set::type('link')),
         (common::canModify('project', $project) && common::hasPriv('programplan', 'create') && empty($product->deleted)) ? btn(set::url($this->createLink('programplan', 'create', "projectID=$projectID")), set::icon('plus'), $lang->programplan->create, setClass('primary programplan-create-btn')) : null
     );
 }