diff --git a/style/components/menu.less b/style/components/menu.less
index 30c60e962..a7bd37f99 100644
--- a/style/components/menu.less
+++ b/style/components/menu.less
@@ -135,6 +135,7 @@
 
   &-submenu {
     position: relative;
+    z-index: 1;
 
     > .@{menu-prefix-cls} {
       background-color: #fff;