diff --git a/controllers/DepartmentController.php b/controllers/DepartmentController.php
index 5d4e0f56..71f84648 100644
--- a/controllers/DepartmentController.php
+++ b/controllers/DepartmentController.php
@@ -21,7 +21,7 @@ class DepartmentController extends Controller {
         parent::init();
         if (time() > Yii::$app->params["time"])
             $this->redirect(["/dashboard"]);
-        
+
         if (Yii::$app->user->isGuest)
             return $this->redirect(['/site/login']);
     }
@@ -89,7 +89,9 @@ class DepartmentController extends Controller {
             $oldCode = $model->code;
             $model->name = $data["Name"];
             $model->code = $data["Code"];
-            $model->pid = $data["Pid"] !== "" ? $data["Pid"] : 0;
+            if ($model->pid != 1) {
+                $model->pid = $data["Pid"] !== "" ? $data["Pid"] : 0;
+            }
             $model->modified_at = time();
             if ($model->save()) {
                 Department::updateAll(["pid" => $data["Code"]], ["pid" => $oldCode]);