diff --git a/components/input/style/mixin.less b/components/input/style/mixin.less
index d122c0f52..21e7d3114 100644
--- a/components/input/style/mixin.less
+++ b/components/input/style/mixin.less
@@ -327,6 +327,10 @@
       }
     }
 
+    & > .@{ant-prefix}-select-focused {
+      z-index: 1;
+    }
+
     & > *:first-child,
     & > .@{ant-prefix}-select:first-child > .@{ant-prefix}-select-selection,
     & > .@{ant-prefix}-calendar-picker:first-child .@{ant-prefix}-input,