diff --git a/style/components/cascader.less b/style/components/cascader.less
index 47f6b11421..3dc3e19492 100644
--- a/style/components/cascader.less
+++ b/style/components/cascader.less
@@ -104,9 +104,16 @@
     padding: 0;
     border-right: 1px solid @border-color-split;
     overflow: auto;
+    &:first-child {
+      border-radius: @border-radius-base 0 0 @border-radius-base;
+    }
     &:last-child {
       border-right-color: transparent;
       margin-right: -1px;
+      border-radius: 0 @border-radius-base @border-radius-base 0;
+    }
+    &:only-child {
+      border-radius: @border-radius-base;
     }
   }
   &-menu-item {