diff --git a/components/menu/style/dark.less b/components/menu/style/dark.less
index 51084c2232..127e6843d8 100644
--- a/components/menu/style/dark.less
+++ b/components/menu/style/dark.less
@@ -24,13 +24,14 @@
   }
 
   &-dark&-horizontal {
-    border-bottom-color: @menu-dark-bg;
+    border-bottom: 0;
   }
 
   &-dark&-horizontal > &-item,
   &-dark&-horizontal > &-submenu {
     border-color: @menu-dark-bg;
     border-bottom: 0;
+    top: 0;
   }
 
   &-dark&-horizontal > &-item > a:before {