diff --git a/components/mentions/style/index.ts b/components/mentions/style/index.ts
index be7c2bacc6..8505637fbf 100644
--- a/components/mentions/style/index.ts
+++ b/components/mentions/style/index.ts
@@ -153,10 +153,10 @@ const genMentionsStyle: GenerateStyle<MentionsToken> = (token) => {
       resetComponent(token),
       genBasicInputStyle(token, {
         largeStyle: {
-          padding: undefined,
+          padding: 0,
         },
         smallStyle: {
-          padding: undefined,
+          padding: 0,
         },
       }),