diff --git a/components/form/style/index.less b/components/form/style/index.less
index 2df14b1e01ec..303275b4d436 100644
--- a/components/form/style/index.less
+++ b/components/form/style/index.less
@@ -113,7 +113,7 @@ input[type='checkbox'] {
   }
 
   &-with-help {
-    margin-bottom: @form-item-margin-bottom - @form-explain-height - @form-help-margin-top;
+    margin-bottom: max(0, @form-item-margin-bottom - @form-explain-height - @form-help-margin-top);
   }
 
   &-label {