diff --git a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/mapper/SysDeptMapper.java b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/mapper/SysDeptMapper.java
index 08dda662c..048d2fa45 100644
--- a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/mapper/SysDeptMapper.java
+++ b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/mapper/SysDeptMapper.java
@@ -1,10 +1,12 @@
 package org.dromara.system.mapper;
 
 import com.baomidou.mybatisplus.core.conditions.Wrapper;
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.baomidou.mybatisplus.core.toolkit.Constants;
 import org.dromara.common.mybatis.annotation.DataColumn;
 import org.dromara.common.mybatis.annotation.DataPermission;
 import org.dromara.common.mybatis.core.mapper.BaseMapperPlus;
+import org.dromara.common.mybatis.helper.DataBaseHelper;
 import org.dromara.system.domain.SysDept;
 import org.dromara.system.domain.vo.SysDeptVo;
 import org.apache.ibatis.annotations.Param;
@@ -34,6 +36,12 @@ public interface SysDeptMapper extends BaseMapperPlus<SysDept, SysDeptVo> {
     })
     long countDeptById(Long deptId);
 
+    default List<SysDept> selectListByParentId(Long parentId) {
+        return this.selectList(new LambdaQueryWrapper<SysDept>()
+            .select(SysDept::getDeptId)
+            .apply(DataBaseHelper.findInSet(parentId, "ancestors")));
+    }
+
     /**
      * 根据角色ID查询部门树信息
      *
diff --git a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysDataScopeServiceImpl.java b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysDataScopeServiceImpl.java
index 018f9a07a..0c07f7f67 100644
--- a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysDataScopeServiceImpl.java
+++ b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysDataScopeServiceImpl.java
@@ -6,7 +6,6 @@ import cn.hutool.core.util.ObjectUtil;
 import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import lombok.RequiredArgsConstructor;
 import org.dromara.common.core.utils.StreamUtils;
-import org.dromara.common.mybatis.helper.DataBaseHelper;
 import org.dromara.system.domain.SysDept;
 import org.dromara.system.domain.SysRoleDept;
 import org.dromara.system.mapper.SysDeptMapper;
@@ -63,9 +62,7 @@ public class SysDataScopeServiceImpl implements ISysDataScopeService {
         if (ObjectUtil.isNull(deptId)) {
             return "-1";
         }
-        List<SysDept> deptList = deptMapper.selectList(new LambdaQueryWrapper<SysDept>()
-            .select(SysDept::getDeptId)
-            .apply(DataBaseHelper.findInSet(deptId, "ancestors")));
+        List<SysDept> deptList = deptMapper.selectListByParentId(deptId);
         List<Long> ids = StreamUtils.toList(deptList, SysDept::getDeptId);
         ids.add(deptId);
         if (CollUtil.isNotEmpty(ids)) {
diff --git a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysPostServiceImpl.java b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysPostServiceImpl.java
index 2c38129ac..e3f4145b4 100644
--- a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysPostServiceImpl.java
+++ b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysPostServiceImpl.java
@@ -13,7 +13,6 @@ import org.dromara.common.core.utils.StreamUtils;
 import org.dromara.common.core.utils.StringUtils;
 import org.dromara.common.mybatis.core.page.PageQuery;
 import org.dromara.common.mybatis.core.page.TableDataInfo;
-import org.dromara.common.mybatis.helper.DataBaseHelper;
 import org.dromara.system.domain.SysDept;
 import org.dromara.system.domain.SysPost;
 import org.dromara.system.domain.SysUserPost;
@@ -27,7 +26,6 @@ import org.springframework.stereotype.Service;
 
 import java.util.Arrays;
 import java.util.List;
-import java.util.stream.Collectors;
 
 /**
  * 岗位信息 服务层处理
@@ -78,12 +76,8 @@ public class SysPostServiceImpl implements ISysPostService {
         } else if (ObjectUtil.isNotNull(bo.getBelongDeptId())) {
             //部门树搜索
             wrapper.and(x -> {
-                List<Long> deptIds = deptMapper.selectList(new LambdaQueryWrapper<SysDept>()
-                        .select(SysDept::getDeptId)
-                        .apply(DataBaseHelper.findInSet(bo.getBelongDeptId(), "ancestors")))
-                    .stream()
-                    .map(SysDept::getDeptId)
-                    .collect(Collectors.toList());
+                List<SysDept> deptList = deptMapper.selectListByParentId(bo.getBelongDeptId());
+                List<Long> deptIds = StreamUtils.toList(deptList, SysDept::getDeptId);
                 deptIds.add(bo.getBelongDeptId());
                 x.in(SysPost::getDeptId, deptIds);
             });
diff --git a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysUserServiceImpl.java b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysUserServiceImpl.java
index 8c6d1d5f5..cd69767cc 100644
--- a/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysUserServiceImpl.java
+++ b/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysUserServiceImpl.java
@@ -24,7 +24,6 @@ import org.dromara.common.core.utils.StreamUtils;
 import org.dromara.common.core.utils.StringUtils;
 import org.dromara.common.mybatis.core.page.PageQuery;
 import org.dromara.common.mybatis.core.page.TableDataInfo;
-import org.dromara.common.mybatis.helper.DataBaseHelper;
 import org.dromara.common.satoken.utils.LoginHelper;
 import org.dromara.system.domain.*;
 import org.dromara.system.domain.bo.SysUserBo;
@@ -89,9 +88,7 @@ public class SysUserServiceImpl implements ISysUserService, UserService {
             .between(params.get("beginTime") != null && params.get("endTime") != null,
                 "u.create_time", params.get("beginTime"), params.get("endTime"))
             .and(ObjectUtil.isNotNull(user.getDeptId()), w -> {
-                List<SysDept> deptList = deptMapper.selectList(new LambdaQueryWrapper<SysDept>()
-                    .select(SysDept::getDeptId)
-                    .apply(DataBaseHelper.findInSet(user.getDeptId(), "ancestors")));
+                List<SysDept> deptList = deptMapper.selectListByParentId(user.getDeptId());
                 List<Long> ids = StreamUtils.toList(deptList, SysDept::getDeptId);
                 ids.add(user.getDeptId());
                 w.in("u.dept_id", ids);