diff --git a/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/controller/admin/customer/CustomerController.java b/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/controller/admin/customer/CustomerController.java
index 5cdccd6..7dd03f7 100644
--- a/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/controller/admin/customer/CustomerController.java
+++ b/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/controller/admin/customer/CustomerController.java
@@ -87,6 +87,12 @@ public class CustomerController {
         return success(isExists);
     }
 
+    @GetMapping("/max-sn")
+    @Operation(summary = "返回当前最大客户sn")
+    public CommonResult<Integer> selectMaxCode() {
+        return success(customerService.selectMaxCode());
+    }
+
     @GetMapping("/page")
     @Operation(summary = "获得客户分页")
     @PreAuthorize("@ss.hasPermission('license:customer:query')")
diff --git a/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/dal/mysql/customer/CustomerMapper.java b/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/dal/mysql/customer/CustomerMapper.java
index e62a0ea..8feeb7c 100644
--- a/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/dal/mysql/customer/CustomerMapper.java
+++ b/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/dal/mysql/customer/CustomerMapper.java
@@ -30,4 +30,5 @@ public interface CustomerMapper extends BaseMapperX<CustomerDO> {
         return selectOne(CustomerDO::getName, name);
     }
 
+    Integer selectMaxCode();
 }
\ No newline at end of file
diff --git a/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/service/customer/CustomerService.java b/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/service/customer/CustomerService.java
index af98aaa..c5b5fd2 100644
--- a/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/service/customer/CustomerService.java
+++ b/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/service/customer/CustomerService.java
@@ -60,4 +60,10 @@ public interface CustomerService {
      */
     Boolean validateCustomerNameExists(String name, Long id);
 
+    /**
+     * 查询当前最大的sn号
+     *
+     * @return
+     */
+    Integer selectMaxCode();
 }
\ No newline at end of file
diff --git a/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/service/customer/CustomerServiceImpl.java b/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/service/customer/CustomerServiceImpl.java
index 6c44bce..1e89bc0 100644
--- a/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/service/customer/CustomerServiceImpl.java
+++ b/agt-module-license/agt-module-license-server/src/main/java/org/agt/module/license/service/customer/CustomerServiceImpl.java
@@ -87,4 +87,10 @@ public class CustomerServiceImpl implements CustomerService {
         return false;
     }
 
+    @Override
+    public Integer selectMaxCode() {
+        Integer maxCode = customerMapper.selectMaxCode();
+        return maxCode == null || maxCode < 2000 ? 2000 : maxCode + 1;
+    }
+
 }
\ No newline at end of file
diff --git a/agt-module-license/agt-module-license-server/src/main/resources/mapper/customer/CustomerMapper.xml b/agt-module-license/agt-module-license-server/src/main/resources/mapper/customer/CustomerMapper.xml
index d98fbb6..cb6e371 100644
--- a/agt-module-license/agt-module-license-server/src/main/resources/mapper/customer/CustomerMapper.xml
+++ b/agt-module-license/agt-module-license-server/src/main/resources/mapper/customer/CustomerMapper.xml
@@ -2,11 +2,8 @@
 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 <mapper namespace="org.agt.module.license.dal.mysql.customer.CustomerMapper">
 
-    <!--
-        一般情况下，尽可能使用 Mapper 进行 CRUD 增删改查即可。
-        无法满足的场景，例如说多表关联查询，才使用 XML 编写 SQL。
-        代码生成器暂时只生成 Mapper XML 文件本身，更多推荐 MybatisX 快速开发插件来生成查询。
-        文档可见：https://www.iocoder.cn/MyBatis/x-plugins/
-     -->
+    <select id="selectMaxCode" resultType="Integer">
+        SELECT max(`code` + 0) from lic_customer;
+    </select>
 
 </mapper>
\ No newline at end of file