diff --git a/app/common/service/InvItemService.php b/app/common/service/InvItemService.php
index 7bd19b4..4048d1f 100644
--- a/app/common/service/InvItemService.php
+++ b/app/common/service/InvItemService.php
@@ -145,7 +145,7 @@ class InvItemService
         $uid = $request->user->uid;
         $name = $uid ? User::where('id', $uid)->value('name') : '';
         $item = InvItem::where('id', $data['id'])->first();
-        $change_qty = $data['change_qty'] - $item['stock_qty'];
+        $change_qty = $data['stock_qty'] - $item['stock_qty'];
         // 记录库存变化日志
         $this->recordStockLog([
             'item_id' => $data['id'],