diff --git a/components/input/style/mixin.less b/components/input/style/mixin.less
index ac15cdabb2..99cba41f68 100644
--- a/components/input/style/mixin.less
+++ b/components/input/style/mixin.less
@@ -71,6 +71,7 @@
     max-width: 100%; // prevent textearea resize from coming out of its container
     height: auto;
     vertical-align: bottom;
+    transition: all .3s, height 0s;
   }
 
   // Size