diff --git a/src/components/SimpleMenu/src/index.less b/src/components/SimpleMenu/src/index.less
index 4f9c9ce1..77ced981 100644
--- a/src/components/SimpleMenu/src/index.less
+++ b/src/components/SimpleMenu/src/index.less
@@ -4,6 +4,7 @@
 .@{prefix-cls} {
   &-dark&-vertical .@{simple-prefix-cls}__parent {
     background-color: @sider-dark-bg-color;
+    border: 0;
     > .@{prefix-cls}-submenu-title {
       background-color: @sider-dark-bg-color;
     }
@@ -12,6 +13,7 @@
   &-dark&-vertical .@{simple-prefix-cls}__children,
   &-dark&-popup .@{simple-prefix-cls}__children {
     background-color: @sider-dark-lighten-bg-color;
+    border: 0;
     > .@{prefix-cls}-submenu-title {
       background-color: @sider-dark-lighten-bg-color;
     }