diff --git a/src/utils/validate.js b/src/utils/validate.js
index 9010a2e..4dcdaa2 100644
--- a/src/utils/validate.js
+++ b/src/utils/validate.js
@@ -5,7 +5,7 @@
 export function isvalidUsername(str) {
   // const valid_map = ['xianfuxing', 'editor']
   // return valid_map.indexOf(str.trim()) >= 0
-  const usernameRegex = /^(?![0-9]+$)[0-9A-Za-z]{4,}$/
+  const usernameRegex = /^(?![0-9]+$)[0-9A-Za-z_]{4,}$/
   return usernameRegex.test(str)
 }