diff --git a/app/Service/Admin/Material/MaterialCategoryService.php b/app/Service/Admin/Material/MaterialCategoryService.php
index 9ecdfb6..5946ab1 100644
--- a/app/Service/Admin/Material/MaterialCategoryService.php
+++ b/app/Service/Admin/Material/MaterialCategoryService.php
@@ -111,8 +111,22 @@ class MaterialCategoryService extends BaseService{
             ->when($cityId > 0,function($query) use($cityId){
                 $query->where('city_id',$cityId);
             })
-            ->where('is_del',MaterialCode::IS_NO_DEL)->get();
+            ->where('is_del',MaterialCode::IS_NO_DEL)->get()->toArray();
 
-        return $this->return->success('success',['list' => $list->toArray()]);
+        $tree = [];
+        $map = [];
+
+        foreach ($list as &$category) {
+            $category['children'] = [];
+            $map[$category['id']] = &$category;
+
+            if ($category['parent_id'] && isset($map[$category['parent_id']])) {
+                $map[$category['parent_id']]['children'][] = &$category;
+            } else {
+                $tree[] = &$category;
+            }
+        }
+
+        return $this->return->success('success',$tree);
     }
 }
\ No newline at end of file
diff --git a/sync/http/admin/auth.http b/sync/http/admin/auth.http
index 6c7488e..3a25829 100644
--- a/sync/http/admin/auth.http
+++ b/sync/http/admin/auth.http
@@ -324,6 +324,11 @@ GET {{host}}/admin/material_category/findById?query_id=1
 Content-Type: application/x-www-form-urlencoded
 Authorization: Bearer {{admin_token}}
 
+### 材料种类列表
+GET {{host}}/admin/material_category/list?query_city_id=1
+content-type: application/json
+Authorization: Bearer {{admin_token}}
+
 ### 材料列表
 GET {{host}}/admin/material/list?limit=10
 content-type: application/json