diff --git a/README.md b/README.md
index 944851b..b013ae4 100644
--- a/README.md
+++ b/README.md
@@ -193,11 +193,13 @@ carwash_order/
 CREATE TABLE vip_customers (
     id INT AUTO_INCREMENT PRIMARY KEY,
     customer_name VARCHAR(100) NOT NULL COMMENT '客户姓名',
-    phone VARCHAR(20) NOT NULL UNIQUE COMMENT '联系电话(唯一)',
+    phone VARCHAR(20) NOT NULL COMMENT '联系电话',
     car_model VARCHAR(50) COMMENT '车型',
     car_number VARCHAR(20) COMMENT '车牌号',
     email VARCHAR(100) COMMENT '邮箱地址',
     birthday DATE COMMENT '生日',
+    -- 复合唯一索引：确保手机号和车牌号组合唯一
+    UNIQUE KEY idx_phone_car_number (phone, car_number)
     notes TEXT COMMENT '备注信息',
     is_active BOOLEAN DEFAULT TRUE,
     created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
diff --git a/carwash_db.sql b/carwash_db.sql
index c5124fe..9229641 100644
--- a/carwash_db.sql
+++ b/carwash_db.sql
@@ -6,7 +6,7 @@ USE carwash_booking;
 CREATE TABLE IF NOT EXISTS vip_customers (
     id INT AUTO_INCREMENT PRIMARY KEY,
     customer_name VARCHAR(100) NOT NULL COMMENT '客户姓名',
-    phone VARCHAR(20) NOT NULL UNIQUE COMMENT '联系电话(唯一)',
+    phone VARCHAR(20) NOT NULL COMMENT '联系电话',
     car_model VARCHAR(50) COMMENT '车型',
     car_number VARCHAR(20) COMMENT '车牌号',
     email VARCHAR(100) COMMENT '邮箱地址',
@@ -14,7 +14,9 @@ CREATE TABLE IF NOT EXISTS vip_customers (
     notes TEXT COMMENT '备注信息',
     is_active BOOLEAN DEFAULT TRUE,
     created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
-    updated_at TIMESTAMP NULL
+    updated_at TIMESTAMP NULL,
+    -- 添加phone和car_number的复合唯一索引，确保手机号+车牌号组合不重复
+    UNIQUE INDEX idx_phone_car_number (phone, car_number)
 );
 
 -- 创建套餐表
diff --git a/update_vip_index.sql b/update_vip_index.sql
new file mode 100644
index 0000000..18830f1
--- /dev/null
+++ b/update_vip_index.sql
@@ -0,0 +1,11 @@
+-- 更新VIP客户表的索引结构
+USE carwash_booking;
+
+-- 1. 移除phone字段的UNIQUE约束（需要先删除原索引）
+ALTER TABLE vip_customers DROP INDEX phone;
+
+-- 2. 添加phone和car_number的复合唯一索引
+ALTER TABLE vip_customers ADD UNIQUE INDEX idx_phone_car_number (phone, car_number);
+
+-- 3. 验证索引添加成功
+SHOW INDEX FROM vip_customers;
\ No newline at end of file
diff --git a/update_vip_table.php b/update_vip_table.php
new file mode 100644
index 0000000..825f8c1
--- /dev/null
+++ b/update_vip_table.php
@@ -0,0 +1,59 @@
+<?php
+// 更新VIP客户表结构的PHP脚本
+require 'db_connect.php';
+
+try {
+    echo "开始更新VIP客户表结构...<br>";
+    
+    // 1. 移除phone字段的UNIQUE约束
+    echo "正在移除phone字段的UNIQUE约束...<br>";
+    $stmt = $pdo->prepare("ALTER TABLE vip_customers DROP INDEX phone");
+    $stmt->execute();
+    echo "✓ phone字段UNIQUE约束已移除<br>";
+    
+    // 2. 添加phone和car_number的复合唯一索引
+    echo "正在添加phone+car_number的复合唯一索引...<br>";
+    $stmt = $pdo->prepare("ALTER TABLE vip_customers ADD UNIQUE INDEX idx_phone_car_number (phone, car_number)");
+    $stmt->execute();
+    echo "✓ 复合唯一索引已添加<br>";
+    
+    // 3. 验证索引
+    echo "正在验证索引...<br>";
+    $stmt = $pdo->prepare("SHOW INDEX FROM vip_customers");
+    $stmt->execute();
+    $indexes = $stmt->fetchAll(PDO::FETCH_ASSOC);
+    
+    echo "<br>✓ 索引列表:<br>";
+    echo "<table border='1' cellpadding='5' cellspacing='0'>";
+    echo "<tr><th>Table</th><th>Non_unique</th><th>Key_name</th><th>Column_name</th></tr>";
+    foreach ($indexes as $index) {
+        echo "<tr>";
+        echo "<td>{$index['Table']}</td>";
+        echo "<td>{$index['Non_unique']}</td>";
+        echo "<td>{$index['Key_name']}</td>";
+        echo "<td>{$index['Column_name']}</td>";
+        echo "</tr>";
+    }
+    echo "</table>";
+    
+    echo "<br>✅ 数据库结构更新成功！";
+    
+} catch (PDOException $e) {
+    echo "<br><span style='color:red'>❌ 错误: " . $e->getMessage() . "</span><br>";
+    
+    // 检查是否是因为索引不存在导致的错误
+    if (strpos($e->getMessage(), "doesn't exist") !== false) {
+        echo "可能是因为索引已经不存在，尝试直接添加复合索引...<br>";
+        try {
+            $stmt = $pdo->prepare("ALTER TABLE vip_customers ADD UNIQUE INDEX idx_phone_car_number (phone, car_number)");
+            $stmt->execute();
+            echo "✓ 复合唯一索引已添加<br>";
+        } catch (PDOException $e2) {
+            echo "<br><span style='color:red'>❌ 添加索引失败: " . $e2->getMessage() . "</span><br>";
+        }
+    }
+} finally {
+    // 关闭连接
+    $pdo = null;
+}
+?>
\ No newline at end of file
diff --git a/vip.php b/vip.php
index 50909a8..13ca0d4 100644
--- a/vip.php
+++ b/vip.php
@@ -24,20 +24,27 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
                     throw new Exception('请填写客户姓名和联系电话');
                 }
                 
-                // 检查VIP客户是否已存在
-                $stmt = $pdo->prepare("SELECT id FROM vip_customers WHERE phone = ?");
-                $stmt->execute([$phone]);
+                // 检查VIP客户是否已存在（基于手机号和车牌号组合）
+                $stmt = $pdo->prepare("SELECT id FROM vip_customers WHERE phone = ? AND car_number = ?");
+                $stmt->execute([$phone, $car_number]);
                 if ($stmt->fetch()) {
-                    throw new Exception('该手机号码已经是VIP客户');
+                    throw new Exception('该手机号和车牌号组合已经是VIP客户');
                 }
                 
                 // 插入VIP客户
                 $stmt = $pdo->prepare("INSERT INTO vip_customers 
                                       (customer_name, phone, car_model, car_number, email, birthday, notes) 
                                       VALUES (?, ?, ?, ?, ?, ?, ?)");
-                $stmt->execute([$customer_name, $phone, $car_model, $car_number, $email, $birthday, $notes]);
-                
-                $success_message = "VIP客户录入成功！";
+                try {
+                    $stmt->execute([$customer_name, $phone, $car_model, $car_number, $email, $birthday, $notes]);
+                    $success_message = "VIP客户录入成功！";
+                } catch (PDOException $e) {
+                    // 捕获唯一约束错误
+                    if ($e->errorInfo[1] == 1062) { // MySQL唯一键约束错误码
+                        throw new Exception('该手机号和车牌号组合已经是VIP客户');
+                    }
+                    throw $e; // 重新抛出其他类型的异常
+                }
                 
             } elseif ($action === 'delete_vip') {
                 $id = (int)$_POST['vip_id'];