diff --git a/components/form/FormItem.jsx b/components/form/FormItem.jsx
index 724bbabae6..fec9fa086a 100644
--- a/components/form/FormItem.jsx
+++ b/components/form/FormItem.jsx
@@ -42,7 +42,7 @@ class FormItem extends React.Component {
     }
     return (
       <div className={classes}>
-        {c1} {c2}
+        {c1}{c2}
       </div>
     );
   }
diff --git a/style/components/form.less b/style/components/form.less
index 8a9c884def..139aa37514 100644
--- a/style/components/form.less
+++ b/style/components/form.less
@@ -107,11 +107,6 @@ input[type="checkbox"] {
   text-align: center;
 }
 
-.@{css-prefix}form-explain {
-  float: left;
-}
-
-
 // 表单下的输入框尺寸唯一: 大尺寸
 form {
   .has-feedback {
@@ -299,7 +294,7 @@ form {
 .is-validating {
   &.has-feedback:after {
     position: absolute;
-    bottom: 0;
+    top: 0;
     right: 0;
     font-family: "anticon" !important;
     .square(@input-height-lg);