diff --git a/module/mr/control.php b/module/mr/control.php
index 1a04cd649e..3061c33d4c 100644
--- a/module/mr/control.php
+++ b/module/mr/control.php
@@ -64,10 +64,14 @@ class mr extends control
         $targetBranchList = array();
         foreach($branchList as $branch) $targetBranchList[$branch] = $branch;
 
+        $gitlabUsers = $this->gitlab->getUserAccountIdPairs($MR->gitlabID);
+
         $this->view->MR               = $MR;
         $this->view->targetBranchList = $targetBranchList;
         $this->view->title            = $this->lang->mr->edit;
         $this->view->users            = array("" => "") + $this->loadModel('gitlab')->getUserIdRealnamePairs($MR->gitlabID); /* Get user list for assignee and reviewer. */
+        $this->view->assignee         = zget($gitlabUsers, $MR->assignee, '');
+        $this->view->reviewer         = zget($gitlabUsers, $MR->reviewer, '');
 
         $this->display();
     }
diff --git a/module/mr/model.php b/module/mr/model.php
index a81532f6c6..f2202e0c22 100644
--- a/module/mr/model.php
+++ b/module/mr/model.php
@@ -186,6 +186,11 @@ class mrModel extends model
 
         $this->apiUpdateMR($oldMR->gitlabID, $oldMR->targetProject, $oldMR->mriid, $newMR);
 
+        /* Change gitlab user ID to zentao account. */
+        $gitlabUsers  = $this->gitlab->getUserIdAccountPairs($oldMR->gitlabID);
+        $MR->assignee = zget($gitlabUsers, $MR->assignee, '');
+        $MR->reviewer = zget($gitlabUsers, $MR->reviewer, '');
+
         /* Update MR in Zentao database. */
         $this->dao->update(TABLE_MR)->data($MR)
             ->where('id')->eq($MRID)
diff --git a/module/mr/view/edit.html.php b/module/mr/view/edit.html.php
index d47637b8b4..582c1eb440 100644
--- a/module/mr/view/edit.html.php
+++ b/module/mr/view/edit.html.php
@@ -51,11 +51,11 @@
           </tr>
           <tr>
             <th><?php echo $lang->mr->assignee;?></th>
-            <td><?php echo html::select('assignee', $users, $MR->assignee, "class='form-control chosen'")?></td>
+            <td><?php echo html::select('assignee', $users, $assignee, "class='form-control chosen'")?></td>
           </tr>
           <tr>
             <th><?php echo $lang->mr->reviewer;?></th>
-            <td><?php echo html::select('reviewer', $users, $MR->reviewer, "class='form-control chosen'")?></td>
+            <td><?php echo html::select('reviewer', $users, $reviewer, "class='form-control chosen'")?></td>
           </tr>
           <tr>
             <th></th>