diff --git a/miniapp/pages/profile/edit.vue b/miniapp/pages/profile/edit.vue
index 626b83c..b2cfdcd 100644
--- a/miniapp/pages/profile/edit.vue
+++ b/miniapp/pages/profile/edit.vue
@@ -104,8 +104,9 @@
           <input 
             v-model="formData.surname" 
             placeholder="请输入姓氏"
-            maxlength="2"
+            maxlength="-1"
             @blur="handleSurnameBlur"
+            @input="handleSurnameInput"
           />
         </view>
 
@@ -1119,12 +1120,28 @@ const handleExpectMarryChange = (e) => {
 }
 
 const handleSurnameBlur = () => {
+  // 姓氏超过2个字时截断
+  if (formData.surname.length > 2) {
+    formData.surname = formData.surname.slice(0, 2)
+  }
   // 姓氏输入完成后触发昵称生成
   if (formData.relationship && formData.surname) {
     formData.nickname = generateNickname(formData.relationship, formData.surname, formData.childGender || 1)
   }
 }
 
+/**
+ * 姓氏输入事件 - 在中文输入法确认后限制长度
+ * iOS中文输入法拼音组合阶段不截断，只在确认汉字后检查
+ */
+const handleSurnameInput = (e) => {
+  const value = e.detail.value || ''
+  // 只在确认的文字超过2个字符时截断
+  if (value.length > 2) {
+    formData.surname = value.slice(0, 2)
+  }
+}
+
 // 择偶要求处理
 const handleAgeMinChange = (e) => {
   const val = ageRangeOptions.value[e.detail.value]