diff --git a/src/views/LoginView.vue b/src/views/LoginView.vue
index 6cb0daf..20c5f84 100644
--- a/src/views/LoginView.vue
+++ b/src/views/LoginView.vue
@@ -125,6 +125,20 @@ function clearHint() {
   apiHintTone.value = 'neutral'
 }
 
+function normalizeSmsCode(value: string): string {
+  return value.replace(/\D/g, '').slice(0, 6)
+}
+
+function onCaptchaInput(event: Event) {
+  const input = event.target as HTMLInputElement | null
+  const next = normalizeSmsCode(input?.value ?? '')
+  captcha.value = next
+  if (input && input.value !== next) {
+    input.value = next
+  }
+  captchaFieldError.value = false
+}
+
 function parseJsonErrorPayload(data: unknown): string {
   if (data == null || typeof data !== 'object') return '请求失败'
   const d = data as Record<string, unknown>
@@ -251,8 +265,9 @@ async function sendCode() {
 
 async function onSubmit() {
   const mobileOk = /^1[3-9]\d{9}$/.test(mobile.value.trim())
-  const codeTrimmed = captcha.value.trim()
-  const captchaOk = codeTrimmed.length > 0
+  const codeTrimmed = normalizeSmsCode(captcha.value)
+  captcha.value = codeTrimmed
+  const captchaOk = codeTrimmed.length === 6
   mobileFieldError.value = !mobileOk
   captchaFieldError.value = mobileOk && !captchaOk
   if (!mobileOk) {
@@ -260,7 +275,7 @@ async function onSubmit() {
     return
   }
   if (!captchaOk) {
-    setHint('请输入验证码', 'error')
+    setHint('请输入 6 位验证码', 'error')
     return
   }
   clearHint()
@@ -430,15 +445,17 @@ onUnmounted(() => {
               />
               <div class="login-page-wls__code-row">
                 <input
-                  v-model.trim="captcha"
+                  :value="captcha"
                   type="text"
                   class="login-page-wls__input login-page-wls__input-code"
                   :class="{ 'login-page-wls__input--error': captchaFieldError }"
                   name="captcha"
                   autocomplete="one-time-code"
                   inputmode="numeric"
+                  pattern="[0-9]*"
+                  maxlength="6"
                   placeholder="验证码"
-                  @input="captchaFieldError = false"
+                  @input="onCaptchaInput"
                 />
                 <button type="button" class="login-page-wls__code-btn" :disabled="codeDisabled" @click="sendCode">
                   {{ codeLabel }}