diff --git a/src/core/api/user.go b/src/core/api/user.go
index 62c48ec7e..a8d178fee 100644
--- a/src/core/api/user.go
+++ b/src/core/api/user.go
@@ -353,7 +353,7 @@ func (ua *UserAPI) modifiable() bool {
 // validate only validate when user register
 func validate(user models.User) error {
 
-	if isIllegalLength(user.Username, 1, 20) {
+	if isIllegalLength(user.Username, 1, 255) {
 		return fmt.Errorf("username with illegal length")
 	}
 	if isContainIllegalChar(user.Username, []string{",", "~", "#", "$", "%"}) {
diff --git a/src/portal/src/app/shared/new-user-form/new-user-form.component.html b/src/portal/src/app/shared/new-user-form/new-user-form.component.html
index eb2bb2fbc..5e7c67e79 100644
--- a/src/portal/src/app/shared/new-user-form/new-user-form.component.html
+++ b/src/portal/src/app/shared/new-user-form/new-user-form.component.html
@@ -4,7 +4,7 @@
             <div class="form-group form-group-override">
                 <label for="username" class="required form-group-label-override">{{'PROFILE.USER_NAME' | translate}}</label>
                 <label for="username" aria-haspopup="true" role="tooltip" class="tooltip tooltip-validation tooltip-md tooltip-bottom-left" [class.invalid]='getValidationState("username")'>
-                    <input type="text" required pattern='[^"~#$%]+' maxLengthExt="255" #usernameInput="ngModel" name="username" [(ngModel)]="newUser.username" id="username" size="30" 
+                    <input type="text" required pattern='[^"~#$%]+' maxLengthExt="80" #usernameInput="ngModel" name="username" [(ngModel)]="newUser.username" id="username" size="30"
                     (input)='handleValidation("username", false)' 
                     (blur)='handleValidation("username", true)'>
                     <span class="tooltip-content">
diff --git a/src/portal/src/i18n/lang/en-us-lang.json b/src/portal/src/i18n/lang/en-us-lang.json
index 714aafcdf..2f5cb28f8 100644
--- a/src/portal/src/i18n/lang/en-us-lang.json
+++ b/src/portal/src/i18n/lang/en-us-lang.json
@@ -51,7 +51,7 @@
     },
     "TOOLTIP": {
         "EMAIL": "Email should be a valid email address like name@example.com.",
-        "USER_NAME": "Cannot contain special characters and maximum length should be 20 characters.",
+        "USER_NAME": "Cannot contain special characters and maximum length should be 80 characters.",
         "FULL_NAME": "Maximum length should be 20 characters.",
         "COMMENT": "Length of comment should be less than 20 characters.",
         "CURRENT_PWD": "Current password is required.",
diff --git a/src/portal/src/i18n/lang/zh-cn-lang.json b/src/portal/src/i18n/lang/zh-cn-lang.json
index 63a6a66cc..df5b652fc 100644
--- a/src/portal/src/i18n/lang/zh-cn-lang.json
+++ b/src/portal/src/i18n/lang/zh-cn-lang.json
@@ -51,7 +51,7 @@
     },
     "TOOLTIP": {
         "EMAIL": "请使用正确的邮箱地址，比如name@example.com。",
-        "USER_NAME": "不能包含特殊字符且长度不能超过20。",
+        "USER_NAME": "不能包含特殊字符且长度不能超过80。",
         "FULL_NAME": "长度不能超过20。",
         "COMMENT": "长度不能超过20。",
         "CURRENT_PWD": "当前密码为必填项。",