diff --git a/module/bug/control.php b/module/bug/control.php
index 84d137d9f0..f40ca35713 100644
--- a/module/bug/control.php
+++ b/module/bug/control.php
@@ -1547,6 +1547,10 @@ class bug extends control
         }
         else
         {
+            /* Delete related issue in gitlab. */
+            $relation = $this->loadModel('gitlab')->getGitlabIssueFromRelation('bug', $bugID);
+            $this->loadModel('gitlab')->deleteIssue($relation->gitlabID, $relation->projectID, 'bug', $bugID);
+ 
             $this->bug->delete(TABLE_BUG, $bugID);
             if($bug->toTask != 0)
             {
diff --git a/module/bug/model.php b/module/bug/model.php
index a52f200b1e..fe879e49e8 100644
--- a/module/bug/model.php
+++ b/module/bug/model.php
@@ -90,7 +90,7 @@ class bugModel extends model
             $bugID = $this->dao->lastInsertID();
             
             /* Sync this bug to gitlab issue. */
-            $this->loadModel('gitlab')->pushToissue('bug', $bugID, $this->post->gitlab, $this->post->gitlabProject);
+            $this->loadModel('gitlab')->pushToIssue('bug', $bugID, $this->post->gitlab, $this->post->gitlabProject);
                 
             $this->file->updateObjectID($this->post->uid, $bugID, 'bug');
             $this->file->saveUpload('bug', $bugID);
@@ -852,6 +852,15 @@ class bugModel extends model
             ->autoCheck()
             ->where('id')->eq($bugID)->exec();
 
+        $relation = $this->loadModel('gitlab')->getGitlabIssueFromRelation('bug', $bugID);
+        $attribute = new stdclass();
+        $attribute->assignee_id = $this->loadModel('gitlab')->getGitlabUserID($relation->gitlabID, $bug->assignedTo);
+        if($attribute->assignee_id != '')
+        {
+            // TODO(dingguodong) we should alert to operator when can not find the user, and the operator should reconfigure user binding.
+            $this->loadModel('gitlab')->apiUpdateIssue($relation->gitlabID, $relation->projectID, $relation->issueID , $attribute);
+        }
+
         if(!dao::isError()) return common::createChanges($oldBug, $bug);
     }
 
diff --git a/module/gitlab/model.php b/module/gitlab/model.php
index 7a2c9fd117..f09d022bc6 100644
--- a/module/gitlab/model.php
+++ b/module/gitlab/model.php
@@ -593,14 +593,16 @@ class gitlabModel extends model
      * Push story to gitlab issue. 
      * 
      * @param  int    $storyID 
-     * @param  int    $gitlab 
-     * @param  int    $gitlabProject 
+     * @param  int    $gitlabID
+     * @param  int    $projectID
      * @access public
      * @return void
      */
     public function pushStory($storyID, $gitlabID, $projectID)
     {
         $story = $this->loadModel('story')->getByID($storyID);
+        if(empty($bug)) return false;
+
         if(!$gitlabID or !$projectID)
         {
             $result    = $this->getGitlabIDprojectID('story', $storyID);
@@ -627,7 +629,7 @@ class gitlabModel extends model
     /**
      * Sync bug to gitlab issue. 
      * 
-     * @param  int    $storyID 
+     * @param  int    $bugID 
      * @param  int    $gitlab 
      * @param  int    $gitlabProject 
      * @access public
@@ -658,7 +660,7 @@ class gitlabModel extends model
      * @access public
      * @return void
      */
-    public function pushToissue($objectType, $objectID, $gitlabID, $projectID)
+    public function pushToIssue($objectType, $objectID, $gitlabID, $projectID)
     {
         $object = $this->loadModel($objectType)->getByID($objectID);
         if(!$gitlabID or !$projectID)
@@ -669,9 +671,9 @@ class gitlabModel extends model
         }
 
         $syncedIssue = $this->getSyncedIssue($objectType = $objectType, $objectID = $objectID, $gitlabID);
-        if($objectType == 'story') $issue = $this->storyToIssue($gitlabID, $projectID, $objectID);
-        if($objectType == 'task')  $issue = $this->taskToIssue($gitlabID, $projectID, $objectID);
-        if($objectType == 'bug')   $issue = $this->bugToIssue($gitlabID, $projectID, $objectID);
+        if($objectType == 'story') $issue = $this->storyToIssue($gitlabID, $projectID, $object);
+        if($objectType == 'task')  $issue = $this->taskToIssue($gitlabID, $projectID, $object);
+        if($objectType == 'bug')   $issue = $this->bugToIssue($gitlabID, $projectID, $object);
         
         if($syncedIssue)
         {
@@ -682,7 +684,7 @@ class gitlabModel extends model
             $this->createZentaoObjectLabel($gitlabID, $projectID, $objectType, $objectID);
             $issue->labels = sprintf($this->config->gitlab->zentaoObjectLabel->name, $objectType, $objectID);
             $issue = $this->apiCreateIssue($gitlabID, $projectID, $issue);
-            if($issue) $this->saveSyncedIssue($objectType, $objectID, $gitlabID, $issue);
+            if($issue) $this->saveSyncedIssue($objectType, $object, $gitlabID, $issue);
         }
     }
 
@@ -770,7 +772,7 @@ class gitlabModel extends model
      * 
      * @param  int    $gitlabID 
      * @param  int    $gitlabProjectID 
-     * @param  object    $task 
+     * @param  object $task 
      * @access public
      * @return object
      */
diff --git a/module/story/control.php b/module/story/control.php
index 869e0c053a..1a43a84db7 100644
--- a/module/story/control.php
+++ b/module/story/control.php
@@ -987,6 +987,10 @@ class story extends control
         }
         else
         {
+            /* Delete related issue in gitlab. */
+            $relation = $this->loadModel('gitlab')->getGitlabIssueFromRelation('story', $storyID);
+            $this->loadModel('gitlab')->deleteIssue($relation->gitlabID, $relation->projectID, 'story', $storyID);
+ 
             $this->story->delete(TABLE_STORY, $storyID);
             if($story->parent > 0)
             {
diff --git a/module/task/model.php b/module/task/model.php
index f465c053d9..246a17f9c0 100644
--- a/module/task/model.php
+++ b/module/task/model.php
@@ -1327,7 +1327,6 @@ class taskModel extends model
             ->where('id')->eq($taskID)->exec();
         
         $relation = $this->loadModel('gitlab')->getGitlabIssueFromRelation('task', $taskID);
-
         $attribute = new stdclass();
         $attribute->assignee_id = $this->loadModel('gitlab')->getGitlabUserID($relation->gitlabID, $task->assignedTo);
         if($attribute->assignee_id != '')