diff --git a/src/locales/langs/en-us.ts b/src/locales/langs/en-us.ts
index 6569a56..045c768 100644
--- a/src/locales/langs/en-us.ts
+++ b/src/locales/langs/en-us.ts
@@ -254,9 +254,6 @@ const local: any = {
         birthDate: 'Birth Date',
         birthDatePlaceholder: 'Please select birth date',
         birthDateRequired: 'Please select birth date',
-        usernameLengthLimit:"Username is too short",
-        usernameExists:"The username is already registered",
-        usernameRequired:"The username cannot be empty",
         phoneInvalid:"The mobile phone number is incorrect",
         phoneExists:"The mobile phone number has been registered",
         emailInvalid:"The email is incorrect",
@@ -265,6 +262,12 @@ const local: any = {
         codeRequired:"The code cannot be empty",
         passwordRequired:"The password cannot be empty",
         passwordLength:"The password is too short",
+        usernameRequired: 'Please enter username',
+        usernameLengthLimit: 'Username must be 3-20 characters',
+        usernameFormatError: 'Username can only contain letters, numbers and underscore',
+        usernameStartWithLetter: 'Username must start with a letter',
+        usernameExists: 'Username already exists',
+        validationError: 'Validation failed, please try again'
       },
       resetPwd: {
         title: 'Reset Password'
diff --git a/src/locales/langs/zh-cn.ts b/src/locales/langs/zh-cn.ts
index 5f54ebb..8aa2231 100644
--- a/src/locales/langs/zh-cn.ts
+++ b/src/locales/langs/zh-cn.ts
@@ -254,9 +254,6 @@ const local:any = {
         birthDate: '出生日期',
         birthDatePlaceholder: '请选择出生日期',
         birthDateRequired: '请选择出生日期',
-        usernameLengthLimit:"用户名太短",
-        usernameExists:"用户名已经注册",
-        usernameRequired:"用户名不能为空",
         phoneInvalid:"手机号格式不正确",
         phoneExists:"手机号已经注册",
         emailInvalid:"邮箱格式不正确",
@@ -265,6 +262,12 @@ const local:any = {
         codeRequired:"验证码不能为空",
         passwordRequired:"密码不能为空",
         passwordLength:"密码太短",
+        usernameRequired: '请输入用户名',
+        usernameLengthLimit: '用户名长度必须在3-20个字符之间',
+        usernameFormatError: '用户名只能包含字母、数字和下划线',
+        usernameStartWithLetter: '用户名必须以字母开头',
+        usernameExists: '该用户名已被使用',
+        validationError: '验证失败，请重试'
       },
       resetPwd: {
         title: '重置密码'
diff --git a/src/views/_builtin/login/modules/register.vue b/src/views/_builtin/login/modules/register.vue
index 7414398..6b50932 100644
--- a/src/views/_builtin/login/modules/register.vue
+++ b/src/views/_builtin/login/modules/register.vue
@@ -71,15 +71,38 @@ const securityModel = reactive<SecurityFormModel>({
 // 第一步表单验证规则
 const basicRules = computed<Record<string, Rule | Rule[]>>(() => {
   const validateUsername = async (_rule: Rule, value: string) => {
-    if (value && (value.length < 4 || value.length > 20)) {
+    // 空值检查
+    if (!value) {
+      return Promise.reject(t('page.login.register.usernameRequired'));
+    }
+
+    // 长度检查 (3-20字符)
+    if (value.length < 3 || value.length > 20) {
       return Promise.reject(t('page.login.register.usernameLengthLimit'));
     }
-    if (value) {
+
+    // 格式检查 (只允许字母、数字、下划线)
+    const usernamePattern = /^[a-zA-Z0-9_]+$/;
+    if (!usernamePattern.test(value)) {
+      return Promise.reject(t('page.login.register.usernameFormatError'));
+    }
+
+    // 首字符必须是字母
+    if (!/^[a-zA-Z]/.test(value)) {
+      return Promise.reject(t('page.login.register.usernameStartWithLetter'));
+    }
+
+    // 重复性检查
+    try {
       const { exists } = await authStore.checkUserRepeat({ username: value, authType: 'u' });
       if (exists) {
         return Promise.reject(t('page.login.register.usernameExists'));
       }
+    } catch (error) {
+      console.error('Username validation error:', error);
+      return Promise.reject(t('page.login.register.validationError'));
     }
+
     return Promise.resolve();
   };