diff --git a/app/common/service/StudentHomeworkService.php b/app/common/service/StudentHomeworkService.php
index e3aa98f..6acee93 100644
--- a/app/common/service/StudentHomeworkService.php
+++ b/app/common/service/StudentHomeworkService.php
@@ -159,7 +159,7 @@ class StudentHomeworkService
                     ->select()->toArray();
             }
 
-            foreach ($list as $item){
+            foreach ($list as &$item){
                 if($item['feedback_file_url']){
                     $item['feedback_file_url'] = json_decode($item['feedback_file_url'],true);
                 }else{