diff --git a/modules/i3plus-core-apiservice/src/main/java/cn/estsh/i3plus/core/apiservice/serviceimpl/busi/SysUserService.java b/modules/i3plus-core-apiservice/src/main/java/cn/estsh/i3plus/core/apiservice/serviceimpl/busi/SysUserService.java
index fad0bf6..435cc6e 100644
--- a/modules/i3plus-core-apiservice/src/main/java/cn/estsh/i3plus/core/apiservice/serviceimpl/busi/SysUserService.java
+++ b/modules/i3plus-core-apiservice/src/main/java/cn/estsh/i3plus/core/apiservice/serviceimpl/busi/SysUserService.java
@@ -985,6 +985,10 @@ public class SysUserService implements ISysUserService {
     public SysUser validatePasswordByLoginNameAndReturnUser(String loginName, String password) {
         SysUser userDb = getSysUserByLoginName(loginName);
         ValidatorBean.checkNotNull(userDb, "不存在的用户信息");
+        //由于数据库的字符集不区分大小写,所以需要根据用户名查询出来后再次比对
+        if (!userDb.getUserLoginName().equals(loginName)){
+            throw new IncorrectCredentialsException("用户名或密码错误");
+        }
         if (userDb.getUserLoginPasswordId() == null || userDb.getUserLoginPasswordId() <= 0) {
             if (!userDb.getUserLoginPassword().equals(SysUserPasswordUtil.encoder(password))) {
                 throw new IncorrectCredentialsException("用户密码错误");