diff --git a/reading-platform-frontend/src/constants/loginAccount.ts b/reading-platform-frontend/src/constants/loginAccount.ts
new file mode 100644
index 0000000..1e32859
--- /dev/null
+++ b/reading-platform-frontend/src/constants/loginAccount.ts
@@ -0,0 +1,9 @@
+/**
+ * 登录账号规则（与租户管理、学校端教师/家长创建约定一致）
+ * 字母开头，4-20 位字母、数字或下划线
+ */
+export const LOGIN_ACCOUNT_PATTERN = /^[a-zA-Z][a-zA-Z0-9_]{3,19}$/;
+
+export const LOGIN_ACCOUNT_PLACEHOLDER = '字母开头，4-20位';
+
+export const LOGIN_ACCOUNT_PATTERN_MESSAGE = '字母开头，4-20位字母数字或下划线';
diff --git a/reading-platform-frontend/src/views/admin/tenants/TenantListView.vue b/reading-platform-frontend/src/views/admin/tenants/TenantListView.vue
index 010fc8f..590c49e 100644
--- a/reading-platform-frontend/src/views/admin/tenants/TenantListView.vue
+++ b/reading-platform-frontend/src/views/admin/tenants/TenantListView.vue
@@ -126,7 +126,7 @@
           <a-input v-model:value="formData.name" placeholder="请输入学校名称" />
         </a-form-item>
         <a-form-item v-if="!isEdit" label="登录账号" name="loginAccount">
-          <a-input v-model:value="formData.loginAccount" placeholder="字母开头，4-20位" :disabled="isEdit" />
+          <a-input v-model:value="formData.loginAccount" :placeholder="LOGIN_ACCOUNT_PLACEHOLDER" :disabled="isEdit" />
         </a-form-item>
         <a-form-item v-if="!isEdit" label="初始密码" name="password">
           <a-input-password v-model:value="formData.password" placeholder="留空则默认为 123456" />
@@ -351,6 +351,11 @@ import {
   type CourseCollectionResponse,
 } from '@/api/admin';
 import { getDiscountTypeText } from '@/api/collections';
+import {
+  LOGIN_ACCOUNT_PATTERN,
+  LOGIN_ACCOUNT_PATTERN_MESSAGE,
+  LOGIN_ACCOUNT_PLACEHOLDER,
+} from '@/constants/loginAccount';
 
 // 搜索表单
 const searchForm = reactive({
@@ -414,7 +419,10 @@ const formRules = {
   name: [{ required: true, message: '请输入学校名称' }],
   loginAccount: [
     { required: true, message: '请输入登录账号' },
-    { pattern: /^[a-zA-Z][a-zA-Z0-9_]{3,19}$/, message: '字母开头，4-20位字母数字或下划线' },
+    {
+      pattern: LOGIN_ACCOUNT_PATTERN,
+      message: LOGIN_ACCOUNT_PATTERN_MESSAGE,
+    },
   ],
   contactPerson: [{ required: true, message: '请输入联系人' }],
   contactPhone: [
diff --git a/reading-platform-frontend/src/views/school/parents/ParentListView.vue b/reading-platform-frontend/src/views/school/parents/ParentListView.vue
index b1c33f4..d723317 100644
--- a/reading-platform-frontend/src/views/school/parents/ParentListView.vue
+++ b/reading-platform-frontend/src/views/school/parents/ParentListView.vue
@@ -148,7 +148,7 @@
           </a-input>
         </a-form-item>
         <a-form-item label="登录账号" name="loginAccount">
-          <a-input v-model:value="formState.loginAccount" placeholder="请输入登录账号" :disabled="isEdit">
+          <a-input v-model:value="formState.loginAccount" :placeholder="LOGIN_ACCOUNT_PLACEHOLDER" :disabled="isEdit">
             <template #prefix>
               <KeyOutlined style="color: #B2BEC3;" />
             </template>
@@ -335,6 +335,11 @@ import {
   getClasses,
 } from '@/api/school';
 import type { Parent, CreateParentDto, ParentChild, Student } from '@/api/school';
+import {
+  LOGIN_ACCOUNT_PATTERN,
+  LOGIN_ACCOUNT_PATTERN_MESSAGE,
+  LOGIN_ACCOUNT_PLACEHOLDER,
+} from '@/constants/loginAccount';
 
 // 状态辅助函数
 const getParentStatusText = (status: string): string => {
@@ -412,14 +417,19 @@ const formState = reactive<CreateParentDto & { id?: number }>({
   password: '',
 });
 
-const rules: Record<string, any[]> = {
+const rules = computed(() => ({
   name: [{ required: true, message: '请输入家长姓名', trigger: 'blur' }],
   phone: [
     { required: true, message: '请输入手机号', trigger: 'blur' },
     { pattern: /^1[3-9]\d{9}$/, message: '请输入正确的手机号', trigger: 'blur' },
   ],
-  loginAccount: [{ required: true, message: '请输入登录账号', trigger: 'blur' }],
-};
+  loginAccount: [
+    { required: true, message: '请输入登录账号', trigger: 'blur' },
+    ...(!isEdit.value
+      ? [{ pattern: LOGIN_ACCOUNT_PATTERN, message: LOGIN_ACCOUNT_PATTERN_MESSAGE, trigger: 'blur' }]
+      : []),
+  ],
+}));
 
 const loadParents = async () => {
   loading.value = true;
diff --git a/reading-platform-frontend/src/views/school/teachers/TeacherListView.vue b/reading-platform-frontend/src/views/school/teachers/TeacherListView.vue
index 25715f1..5f2f67d 100644
--- a/reading-platform-frontend/src/views/school/teachers/TeacherListView.vue
+++ b/reading-platform-frontend/src/views/school/teachers/TeacherListView.vue
@@ -152,7 +152,7 @@
           </a-input>
         </a-form-item>
         <a-form-item label="登录账号" name="loginAccount">
-          <a-input v-model:value="formState.loginAccount" placeholder="请输入登录账号" :disabled="isEdit">
+          <a-input v-model:value="formState.loginAccount" :placeholder="LOGIN_ACCOUNT_PLACEHOLDER" :disabled="isEdit">
             <template #prefix>
               <KeyOutlined style="color: #B2BEC3;" />
             </template>
@@ -234,6 +234,11 @@ import {
   getClasses,
 } from '@/api/school';
 import type { Teacher, CreateTeacherDto, ClassInfo } from '@/api/school';
+import {
+  LOGIN_ACCOUNT_PATTERN,
+  LOGIN_ACCOUNT_PATTERN_MESSAGE,
+  LOGIN_ACCOUNT_PLACEHOLDER,
+} from '@/constants/loginAccount';
 
 // 状态辅助函数
 const getTeacherStatusText = (status: string): string => {
@@ -301,14 +306,19 @@ const formState = reactive<CreateTeacherDto & { id?: number; status?: string }>(
   status: 'ACTIVE',
 });
 
-const rules: Record<string, any[]> = {
+const rules = computed(() => ({
   name: [{ required: true, message: '请输入教师姓名', trigger: 'blur' }],
   phone: [
     { required: true, message: '请输入手机号', trigger: 'blur' },
     { pattern: /^1[3-9]\d{9}$/, message: '请输入正确的手机号', trigger: 'blur' },
   ],
-  loginAccount: [{ required: true, message: '请输入登录账号', trigger: 'blur' }],
-};
+  loginAccount: [
+    { required: true, message: '请输入登录账号', trigger: 'blur' },
+    ...(!isEdit.value
+      ? [{ pattern: LOGIN_ACCOUNT_PATTERN, message: LOGIN_ACCOUNT_PATTERN_MESSAGE, trigger: 'blur' }]
+      : []),
+  ],
+}));
 
 const loadTeachers = async () => {
   loading.value = true;