diff --git a/code/springboot/newBank/src/main/java/demo/zhangjialei/controller/userController.java b/code/springboot/newBank/src/main/java/demo/zhangjialei/controller/userController.java
index d7b7a3a00..a7becb5b3 100644
--- a/code/springboot/newBank/src/main/java/demo/zhangjialei/controller/userController.java
+++ b/code/springboot/newBank/src/main/java/demo/zhangjialei/controller/userController.java
@@ -42,11 +42,11 @@ public class userController {
     public String makeUserNo(){
 
         // 将数据库中客户编号 +1
-        String sql_update = String.format("update userNoMaker set userNo = userNo + 1");
+        String sql_update = "update userNoMaker set userNo = userNo + 1";
         jdbcTemplate.update(sql_update);
 
         // 返回 +1 后的客户编号
-        String sql_select = String.format("select userNo from userNoMaker");
+        String sql_select = "select userNo from userNoMaker";
         int No = (int) jdbcTemplate.queryForList(sql_select).get(0).get("userNo");
 
         String userNo = String.format("%08d", No);
@@ -102,6 +102,13 @@ public class userController {
         // 获取要修改的客户编号
         String userNo = request.getParameter("userNo");
 
+        // 判断客户编号是否存在
+        List<Map<String,Object>> res = jdbcTemplate.queryForList(String.format("select * from user_info ui, user_roster ur where ui.userNo = ur.userNo and ui.userNo = %s;", userNo));
+        if(res.size() == 0) {
+            // 账户不存在拦截
+            return "400";
+        }
+
         // 获取客户输入数据
         String passwd = request.getParameter("passwd");     // 密码
         String userName = request.getParameter("userName"); // 姓名
diff --git a/项目管理/银行-客户api文档v0.3(word).docx b/项目管理/银行-客户api文档v0.3(word).docx
index f7aa3e9ed..bc25360fa 100644
Binary files a/项目管理/银行-客户api文档v0.3(word).docx and b/项目管理/银行-客户api文档v0.3(word).docx differ