diff --git a/pjcloud-upms/pjcloud-upms-biz/src/main/java/com/bsd/pjcloud/admin/service/impl/SysUserServiceImpl.java b/pjcloud-upms/pjcloud-upms-biz/src/main/java/com/bsd/pjcloud/admin/service/impl/SysUserServiceImpl.java
index 32f512702..d9ff9f753 100644
--- a/pjcloud-upms/pjcloud-upms-biz/src/main/java/com/bsd/pjcloud/admin/service/impl/SysUserServiceImpl.java
+++ b/pjcloud-upms/pjcloud-upms-biz/src/main/java/com/bsd/pjcloud/admin/service/impl/SysUserServiceImpl.java
@@ -68,6 +68,7 @@ import com.bsd.pjcloud.flow.task.constant.TaskCheckStatusEnum;
 import com.bsd.pjcloud.flow.task.dto.ProcessNodeRecordAssignUserParamDto;
 import com.bsd.pjcloud.flow.task.dto.TaskDto;
 import com.bsd.pjcloud.wallet.api.dto.recharge.excel.WalletRechargeExcelDto;
+import com.bsd.pjcloud.wallet.api.entity.mch.MchManageEntity;
 import com.bsd.pjcloud.wallet.api.feign.RemoteMchService;
 import com.bsd.pjcloud.wallet.api.feign.RemoteWalletService;
 import com.bsd.pjcloud.wallet.api.utils.WalletDataUtil;
@@ -393,6 +394,11 @@ public class SysUserServiceImpl extends ServiceImpl<SysUserMapper, SysUser> impl
             sysUser.setPassword(ENCODER.encode(userDto.getPassword()));
         }
 
+        // 判断用户username是否重复
+        if (existUsername(userDto.getUserId(), userDto.getUsername())) {
+            throw new RuntimeException("该用户名已存在");
+        }
+
         this.updateById(sysUser);
 
         // 更新用户角色表
@@ -938,4 +944,15 @@ public class SysUserServiceImpl extends ServiceImpl<SysUserMapper, SysUser> impl
                 .like(StrUtil.isNotBlank(name), SysUser::getName, name));
         return com.bsd.pjcloud.common.core.util.BeanUtils.toBean(sysUsers, SimpleUserListVO.class);
     }
+
+    private boolean existUsername(Long userId, String username) {
+        Long count = baseMapper.selectCount(new LambdaQueryWrapper<SysUser>()
+                .eq(ObjectUtil.isNotEmpty(username), SysUser::getUsername, username)
+                .ne(ObjectUtil.isNotEmpty(userId), SysUser::getUserId, userId)
+        );
+        if (ObjectUtil.isNotEmpty(userId)) {
+            return count >= 1;
+        }
+        return count > 0;
+    }
 }