diff --git a/components/form/style/index.less b/components/form/style/index.less
index 7bff52228a81..ebdbff4ca30f 100644
--- a/components/form/style/index.less
+++ b/components/form/style/index.less
@@ -49,8 +49,8 @@
 }
 
 .explainAndExtraDistance(@num) when (@num < 0) {
-  margin-top: floor(@num);
-  margin-bottom: floor(@num);
+  margin-top: ceil(@num);
+  margin-bottom: ceil(@num);
 }
 
 // ================================================================