diff --git a/app/adminapi/lists/material/MaterialClassifyLists.php b/app/adminapi/lists/material/MaterialClassifyLists.php
index 51967086d..13a463685 100644
--- a/app/adminapi/lists/material/MaterialClassifyLists.php
+++ b/app/adminapi/lists/material/MaterialClassifyLists.php
@@ -60,8 +60,8 @@ class MaterialClassifyLists extends BaseAdminDataLists implements ListsSearchInt
             ->order(['id' => 'asc'])
             ->select()
             ->toArray();
-	    $tree = buildTree($data,'pid');
-	    return $tree;
+	    $data[] = ['id'=>0,'pid'=>0,'name'=>'顶级分类'];
+	    return buildTree($data,'pid');
     }