diff --git a/src/main/java/com/gxwebsoft/cms/controller/ArticleCategoryController.java b/src/main/java/com/gxwebsoft/cms/controller/ArticleCategoryController.java
index bde2a0c..a4c90c1 100644
--- a/src/main/java/com/gxwebsoft/cms/controller/ArticleCategoryController.java
+++ b/src/main/java/com/gxwebsoft/cms/controller/ArticleCategoryController.java
@@ -1,140 +1,144 @@
-package com.gxwebsoft.cms.controller;
-
-import com.gxwebsoft.common.core.web.BaseController;
-import com.gxwebsoft.cms.service.ArticleCategoryService;
-import com.gxwebsoft.cms.entity.ArticleCategory;
-import com.gxwebsoft.cms.param.ArticleCategoryParam;
-import com.gxwebsoft.common.core.web.ApiResult;
-import com.gxwebsoft.common.core.web.PageResult;
-import com.gxwebsoft.common.core.web.PageParam;
-import com.gxwebsoft.common.core.web.BatchParam;
-import com.gxwebsoft.common.core.annotation.OperationLog;
-import com.gxwebsoft.common.system.entity.User;
-import io.swagger.annotations.Api;
-import io.swagger.annotations.ApiOperation;
-import org.springframework.security.access.prepost.PreAuthorize;
-import org.springframework.web.bind.annotation.*;
-
-import javax.annotation.Resource;
-import java.util.List;
-
-/**
- * 文章分类表控制器
- *
- * @author 科技小王子
- * @since 2022-11-22 17:49:15
- */
-@Api(tags = "文章分类表管理")
-@RestController
-@RequestMapping("/api/cms/article-category")
-public class ArticleCategoryController extends BaseController {
-    @Resource
-    private ArticleCategoryService articleCategoryService;
-
-    @PreAuthorize("hasAuthority('cms:articleCategory:list')")
-    @OperationLog
-    @ApiOperation("分页查询文章分类表")
-    @GetMapping("/page")
-    public ApiResult<PageResult<ArticleCategory>> page(ArticleCategoryParam param) {
-        PageParam<ArticleCategory, ArticleCategoryParam> page = new PageParam<>(param);
-//        page.setDefaultOrder("create_time desc");
-        page.setDefaultOrder("sort_number");
-        return success(articleCategoryService.page(page, page.getWrapper()));
-        // 使用关联查询
-        //return success(articleCategoryService.pageRel(param));
-    }
-
-    @OperationLog
-    @ApiOperation("查询全部文章分类表")
-    @GetMapping()
-    public ApiResult<List<ArticleCategory>> list(ArticleCategoryParam param) {
-        PageParam<ArticleCategory, ArticleCategoryParam> page = new PageParam<>(param);
-//        page.setDefaultOrder("create_time desc");
-        page.setDefaultOrder("sort_number");
-        return success(articleCategoryService.list(page.getOrderWrapper()));
-        // 使用关联查询
-        //return success(articleCategoryService.listRel(param));
-    }
-
-    @PreAuthorize("hasAuthority('cms:articleCategory:list')")
-    @OperationLog
-    @ApiOperation("根据id查询文章分类表")
-    @GetMapping("/{id}")
-    public ApiResult<ArticleCategory> get(@PathVariable("id") Integer id) {
-        return success(articleCategoryService.getById(id));
-        // 使用关联查询
-        //return success(articleCategoryService.getByIdRel(id));
-    }
-
-    @PreAuthorize("hasAuthority('cms:articleCategory:save')")
-    @OperationLog
-    @ApiOperation("添加文章分类表")
-    @PostMapping()
-    public ApiResult<?> save(@RequestBody ArticleCategory articleCategory) {
-        // 记录当前登录用户id、租户id
-        User loginUser = getLoginUser();
-        if (loginUser != null) {
-          articleCategory.setUserId(loginUser.getUserId());
-        }
-        if (articleCategoryService.save(articleCategory)) {
-            return success("添加成功");
-        }
-        return fail("添加失败");
-    }
-
-    @PreAuthorize("hasAuthority('cms:articleCategory:update')")
-    @OperationLog
-    @ApiOperation("修改文章分类表")
-    @PutMapping()
-    public ApiResult<?> update(@RequestBody ArticleCategory articleCategory) {
-        if (articleCategoryService.updateById(articleCategory)) {
-            return success("修改成功");
-        }
-        return fail("修改失败");
-    }
-
-    @PreAuthorize("hasAuthority('cms:articleCategory:remove')")
-    @OperationLog
-    @ApiOperation("删除文章分类表")
-    @DeleteMapping("/{id}")
-    public ApiResult<?> remove(@PathVariable("id") Integer id) {
-        if (articleCategoryService.removeById(id)) {
-            return success("删除成功");
-        }
-        return fail("删除失败");
-    }
-
-    @PreAuthorize("hasAuthority('cms:articleCategory:save')")
-    @OperationLog
-    @ApiOperation("批量添加文章分类表")
-    @PostMapping("/batch")
-    public ApiResult<?> saveBatch(@RequestBody List<ArticleCategory> list) {
-        if (articleCategoryService.saveBatch(list)) {
-            return success("添加成功");
-        }
-        return fail("添加失败");
-    }
-
-    @PreAuthorize("hasAuthority('cms:articleCategory:update')")
-    @OperationLog
-    @ApiOperation("批量修改文章分类表")
-    @PutMapping("/batch")
-    public ApiResult<?> removeBatch(@RequestBody BatchParam<ArticleCategory> batchParam) {
-        if (batchParam.update(articleCategoryService, "category_id")) {
-            return success("修改成功");
-        }
-        return fail("修改失败");
-    }
-
-    @PreAuthorize("hasAuthority('cms:articleCategory:remove')")
-    @OperationLog
-    @ApiOperation("批量删除文章分类表")
-    @DeleteMapping("/batch")
-    public ApiResult<?> removeBatch(@RequestBody List<Integer> ids) {
-        if (articleCategoryService.removeByIds(ids)) {
-            return success("删除成功");
-        }
-        return fail("删除失败");
-    }
-
-}
+package com.gxwebsoft.cms.controller;
+
+import com.gxwebsoft.common.core.web.BaseController;
+import com.gxwebsoft.cms.service.ArticleCategoryService;
+import com.gxwebsoft.cms.entity.ArticleCategory;
+import com.gxwebsoft.cms.param.ArticleCategoryParam;
+import com.gxwebsoft.common.core.web.ApiResult;
+import com.gxwebsoft.common.core.web.PageResult;
+import com.gxwebsoft.common.core.web.PageParam;
+import com.gxwebsoft.common.core.web.BatchParam;
+import com.gxwebsoft.common.core.annotation.OperationLog;
+import com.gxwebsoft.common.system.entity.User;
+import io.swagger.annotations.Api;
+import io.swagger.annotations.ApiOperation;
+import org.springframework.security.access.prepost.PreAuthorize;
+import org.springframework.web.bind.annotation.*;
+
+import javax.annotation.Resource;
+import java.util.List;
+
+/**
+ * 文章分类表控制器
+ *
+ * @author 科技小王子
+ * @since 2022-11-22 17:49:15
+ */
+@Api(tags = "文章分类表管理")
+@RestController
+@RequestMapping("/api/cms/article-category")
+public class ArticleCategoryController extends BaseController {
+    @Resource
+    private ArticleCategoryService articleCategoryService;
+
+    @PreAuthorize("hasAuthority('cms:articleCategory:list')")
+    @OperationLog
+    @ApiOperation("分页查询文章分类表")
+    @GetMapping("/page")
+    public ApiResult<PageResult<ArticleCategory>> page(ArticleCategoryParam param) {
+        PageParam<ArticleCategory, ArticleCategoryParam> page = new PageParam<>(param);
+//        page.setDefaultOrder("create_time desc");
+        page.setDefaultOrder("sort_number");
+        return success(articleCategoryService.page(page, page.getWrapper()));
+        // 使用关联查询
+        //return success(articleCategoryService.pageRel(param));
+    }
+
+    @OperationLog
+    @ApiOperation("查询全部文章分类表")
+    @GetMapping()
+    public ApiResult<List<ArticleCategory>> list(ArticleCategoryParam param) {
+        PageParam<ArticleCategory, ArticleCategoryParam> page = new PageParam<>(param);
+//        page.setDefaultOrder("create_time desc");
+        page.setDefaultOrder("sort_number");
+        return success(articleCategoryService.list(page.getOrderWrapper()));
+        // 使用关联查询
+        //return success(articleCategoryService.listRel(param));
+    }
+
+    @PreAuthorize("hasAuthority('cms:articleCategory:list')")
+    @OperationLog
+    @ApiOperation("根据id查询文章分类表")
+    @GetMapping("/{id}")
+    public ApiResult<ArticleCategory> get(@PathVariable("id") Integer id) {
+        return success(articleCategoryService.getById(id));
+        // 使用关联查询
+        //return success(articleCategoryService.getByIdRel(id));
+    }
+
+    @PreAuthorize("hasAuthority('cms:articleCategory:save')")
+    @OperationLog
+    @ApiOperation("添加文章分类表")
+    @PostMapping()
+    public ApiResult<?> save(@RequestBody ArticleCategory articleCategory) {
+        // 校验上级分类，避免产生自引用/成环的脏数据
+        articleCategoryService.checkParentValid(articleCategory);
+        // 记录当前登录用户id、租户id
+        User loginUser = getLoginUser();
+        if (loginUser != null) {
+          articleCategory.setUserId(loginUser.getUserId());
+        }
+        if (articleCategoryService.save(articleCategory)) {
+            return success("添加成功");
+        }
+        return fail("添加失败");
+    }
+
+    @PreAuthorize("hasAuthority('cms:articleCategory:update')")
+    @OperationLog
+    @ApiOperation("修改文章分类表")
+    @PutMapping()
+    public ApiResult<?> update(@RequestBody ArticleCategory articleCategory) {
+        // 校验上级分类，避免把自己的下级设成上级而形成环
+        articleCategoryService.checkParentValid(articleCategory);
+        if (articleCategoryService.updateById(articleCategory)) {
+            return success("修改成功");
+        }
+        return fail("修改失败");
+    }
+
+    @PreAuthorize("hasAuthority('cms:articleCategory:remove')")
+    @OperationLog
+    @ApiOperation("删除文章分类表")
+    @DeleteMapping("/{id}")
+    public ApiResult<?> remove(@PathVariable("id") Integer id) {
+        if (articleCategoryService.removeById(id)) {
+            return success("删除成功");
+        }
+        return fail("删除失败");
+    }
+
+    @PreAuthorize("hasAuthority('cms:articleCategory:save')")
+    @OperationLog
+    @ApiOperation("批量添加文章分类表")
+    @PostMapping("/batch")
+    public ApiResult<?> saveBatch(@RequestBody List<ArticleCategory> list) {
+        if (articleCategoryService.saveBatch(list)) {
+            return success("添加成功");
+        }
+        return fail("添加失败");
+    }
+
+    @PreAuthorize("hasAuthority('cms:articleCategory:update')")
+    @OperationLog
+    @ApiOperation("批量修改文章分类表")
+    @PutMapping("/batch")
+    public ApiResult<?> removeBatch(@RequestBody BatchParam<ArticleCategory> batchParam) {
+        if (batchParam.update(articleCategoryService, "category_id")) {
+            return success("修改成功");
+        }
+        return fail("修改失败");
+    }
+
+    @PreAuthorize("hasAuthority('cms:articleCategory:remove')")
+    @OperationLog
+    @ApiOperation("批量删除文章分类表")
+    @DeleteMapping("/batch")
+    public ApiResult<?> removeBatch(@RequestBody List<Integer> ids) {
+        if (articleCategoryService.removeByIds(ids)) {
+            return success("删除成功");
+        }
+        return fail("删除失败");
+    }
+
+}
diff --git a/src/main/java/com/gxwebsoft/cms/service/ArticleCategoryService.java b/src/main/java/com/gxwebsoft/cms/service/ArticleCategoryService.java
index dbdd6ab..5e9493f 100644
--- a/src/main/java/com/gxwebsoft/cms/service/ArticleCategoryService.java
+++ b/src/main/java/com/gxwebsoft/cms/service/ArticleCategoryService.java
@@ -1,43 +1,55 @@
-package com.gxwebsoft.cms.service;
-
-import com.baomidou.mybatisplus.extension.service.IService;
-import com.gxwebsoft.common.core.web.PageResult;
-import com.gxwebsoft.cms.entity.ArticleCategory;
-import com.gxwebsoft.cms.param.ArticleCategoryParam;
-
-import java.util.List;
-
-/**
- * 文章分类表Service
- *
- * @author 科技小王子
- * @since 2022-11-22 17:49:15
- */
-public interface ArticleCategoryService extends IService<ArticleCategory> {
-
-    /**
-     * 分页关联查询
-     *
-     * @param param 查询参数
-     * @return PageResult<ArticleCategory>
-     */
-    PageResult<ArticleCategory> pageRel(ArticleCategoryParam param);
-
-    /**
-     * 关联查询全部
-     *
-     * @param param 查询参数
-     * @return List<ArticleCategory>
-     */
-    List<ArticleCategory> listRel(ArticleCategoryParam param);
-
-    /**
-     * 根据id查询
-     *
-     * @param categoryId 文章分类ID
-     * @return ArticleCategory
-     */
-    ArticleCategory getByIdRel(Integer categoryId);
-
-    List<ArticleCategory> childList(Integer categoryId);
-}
+package com.gxwebsoft.cms.service;
+
+import com.baomidou.mybatisplus.extension.service.IService;
+import com.gxwebsoft.common.core.web.PageResult;
+import com.gxwebsoft.cms.entity.ArticleCategory;
+import com.gxwebsoft.cms.param.ArticleCategoryParam;
+
+import java.util.List;
+
+/**
+ * 文章分类表Service
+ *
+ * @author 科技小王子
+ * @since 2022-11-22 17:49:15
+ */
+public interface ArticleCategoryService extends IService<ArticleCategory> {
+
+    /**
+     * 分页关联查询
+     *
+     * @param param 查询参数
+     * @return PageResult<ArticleCategory>
+     */
+    PageResult<ArticleCategory> pageRel(ArticleCategoryParam param);
+
+    /**
+     * 关联查询全部
+     *
+     * @param param 查询参数
+     * @return List<ArticleCategory>
+     */
+    List<ArticleCategory> listRel(ArticleCategoryParam param);
+
+    /**
+     * 根据id查询
+     *
+     * @param categoryId 文章分类ID
+     * @return ArticleCategory
+     */
+    ArticleCategory getByIdRel(Integer categoryId);
+
+    List<ArticleCategory> childList(Integer categoryId);
+
+    /**
+     * 校验上级分类是否合法
+     * <p>
+     * 分类是自关联结构，一旦出现「自己指向自己」或「祖先指向后代」的环，
+     * 前端构建分类树时会直接抛错，导致整个页面无法渲染，因此写入前必须拦截。
+     * </p>
+     *
+     * @param category 待保存的分类，修改时需带 categoryId
+     * @throws com.gxwebsoft.common.core.exception.BusinessException 校验不通过时抛出，message 为面向前端的中文提示
+     */
+    void checkParentValid(ArticleCategory category);
+}
diff --git a/src/main/java/com/gxwebsoft/cms/service/impl/ArticleCategoryServiceImpl.java b/src/main/java/com/gxwebsoft/cms/service/impl/ArticleCategoryServiceImpl.java
index 7c78bf7..7bb33e5 100644
--- a/src/main/java/com/gxwebsoft/cms/service/impl/ArticleCategoryServiceImpl.java
+++ b/src/main/java/com/gxwebsoft/cms/service/impl/ArticleCategoryServiceImpl.java
@@ -1,56 +1,92 @@
-package com.gxwebsoft.cms.service.impl;
-
-import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
-import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
-import com.gxwebsoft.cms.mapper.ArticleCategoryMapper;
-import com.gxwebsoft.cms.service.ArticleCategoryService;
-import com.gxwebsoft.cms.entity.ArticleCategory;
-import com.gxwebsoft.cms.param.ArticleCategoryParam;
-import com.gxwebsoft.common.core.web.PageParam;
-import com.gxwebsoft.common.core.web.PageResult;
-import org.springframework.stereotype.Service;
-
-import java.util.List;
-
-/**
- * 文章分类表Service实现
- *
- * @author 科技小王子
- * @since 2022-11-22 17:49:15
- */
-@Service
-public class ArticleCategoryServiceImpl extends ServiceImpl<ArticleCategoryMapper, ArticleCategory> implements ArticleCategoryService {
-
-    @Override
-    public PageResult<ArticleCategory> pageRel(ArticleCategoryParam param) {
-        PageParam<ArticleCategory, ArticleCategoryParam> page = new PageParam<>(param);
-        //page.setDefaultOrder("create_time desc");
-        List<ArticleCategory> list = baseMapper.selectPageRel(page, param);
-        return new PageResult<>(list, page.getTotal());
-    }
-
-    @Override
-    public List<ArticleCategory> listRel(ArticleCategoryParam param) {
-        List<ArticleCategory> list = baseMapper.selectListRel(param);
-        // 排序
-        PageParam<ArticleCategory, ArticleCategoryParam> page = new PageParam<>();
-        //page.setDefaultOrder("create_time desc");
-        return page.sortRecords(list);
-    }
-
-    @Override
-    public ArticleCategory getByIdRel(Integer categoryId) {
-        ArticleCategoryParam param = new ArticleCategoryParam();
-        param.setCategoryId(categoryId);
-        return param.getOne(baseMapper.selectListRel(param));
-    }
-
-    @Override
-    public List<ArticleCategory> childList(Integer categoryId) {
-        return list(
-                new LambdaQueryWrapper<ArticleCategory>()
-                        .eq(ArticleCategory::getParentId, categoryId)
-        );
-    }
-
-}
+package com.gxwebsoft.cms.service.impl;
+
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
+import com.gxwebsoft.cms.mapper.ArticleCategoryMapper;
+import com.gxwebsoft.cms.service.ArticleCategoryService;
+import com.gxwebsoft.cms.entity.ArticleCategory;
+import com.gxwebsoft.cms.param.ArticleCategoryParam;
+import com.gxwebsoft.common.core.exception.BusinessException;
+import com.gxwebsoft.common.core.web.PageParam;
+import com.gxwebsoft.common.core.web.PageResult;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+/**
+ * 文章分类表Service实现
+ *
+ * @author 科技小王子
+ * @since 2022-11-22 17:49:15
+ */
+@Service
+public class ArticleCategoryServiceImpl extends ServiceImpl<ArticleCategoryMapper, ArticleCategory> implements ArticleCategoryService {
+
+    @Override
+    public PageResult<ArticleCategory> pageRel(ArticleCategoryParam param) {
+        PageParam<ArticleCategory, ArticleCategoryParam> page = new PageParam<>(param);
+        //page.setDefaultOrder("create_time desc");
+        List<ArticleCategory> list = baseMapper.selectPageRel(page, param);
+        return new PageResult<>(list, page.getTotal());
+    }
+
+    @Override
+    public List<ArticleCategory> listRel(ArticleCategoryParam param) {
+        List<ArticleCategory> list = baseMapper.selectListRel(param);
+        // 排序
+        PageParam<ArticleCategory, ArticleCategoryParam> page = new PageParam<>();
+        //page.setDefaultOrder("create_time desc");
+        return page.sortRecords(list);
+    }
+
+    @Override
+    public ArticleCategory getByIdRel(Integer categoryId) {
+        ArticleCategoryParam param = new ArticleCategoryParam();
+        param.setCategoryId(categoryId);
+        return param.getOne(baseMapper.selectListRel(param));
+    }
+
+    @Override
+    public List<ArticleCategory> childList(Integer categoryId) {
+        return list(
+                new LambdaQueryWrapper<ArticleCategory>()
+                        .eq(ArticleCategory::getParentId, categoryId)
+        );
+    }
+
+    @Override
+    public void checkParentValid(ArticleCategory category) {
+        if (category == null) {
+            return;
+        }
+        Integer categoryId = category.getCategoryId();
+        Integer parentId = category.getParentId();
+        // 顶级分类
+        if (parentId == null || parentId == 0) {
+            return;
+        }
+        if (categoryId != null && categoryId.equals(parentId)) {
+            throw new BusinessException("上级分类不能选择自己");
+        }
+        if (categoryId == null) {
+            // 新增时父级必然已存在，无需继续校验
+            return;
+        }
+        // 修改场景：沿父级链向上回溯，父级链中不允许出现自己
+        Integer cursor = parentId;
+        // 兜底防止历史脏数据造成死循环
+        int depth = 0;
+        int maxDepth = 64;
+        while (cursor != null && cursor != 0 && depth++ < maxDepth) {
+            if (cursor.equals(categoryId)) {
+                throw new BusinessException("上级分类不能选择自己的下级分类");
+            }
+            ArticleCategory parent = getById(cursor);
+            if (parent == null) {
+                break;
+            }
+            cursor = parent.getParentId();
+        }
+    }
+
+}