diff --git a/src/main/java/com/yunhai/cms/service/impl/CategoryService.java b/src/main/java/com/yunhai/cms/service/impl/CategoryService.java
index fa8bfba..48202b8 100644
--- a/src/main/java/com/yunhai/cms/service/impl/CategoryService.java
+++ b/src/main/java/com/yunhai/cms/service/impl/CategoryService.java
@@ -80,8 +80,7 @@ public class CategoryService {
         if (StringUtils.hasText(req.getHomeStyle()) && !HOME_STYLE_VALUES.contains(req.getHomeStyle())) {
             throw new BizException(ErrorCode.PARAM_ERROR,
                     "首页展示形态非法：" + req.getHomeStyle() + "（仅支持 news_grid / media_focus）");
-        }
-        CmsCategory category;
+        }        CmsCategory category;
         if (req.getId() == null) {
             category = new CmsCategory();
             category.setSiteId(site.getId());
@@ -98,7 +97,9 @@ public class CategoryService {
         category.setType(type.getCode());
         category.setLinkUrl(req.getLinkUrl());
         category.setTemplate(req.getTemplate());
-        category.setHomeStyle(StringUtils.hasText(req.getHomeStyle()) ? req.getHomeStyle() : null);
+        // F3（docs/20 §四）：「首页展示形态」唯一入口收敛到首页布局编辑器，栏目管理不再编辑该字段——
+        // 入参缺省时保留已有值（存量数据不清除，无布局站点的回落渲染仍消费）；显式传值仍校验（API 兼容）
+        category.setHomeStyle(StringUtils.hasText(req.getHomeStyle()) ? req.getHomeStyle() : category.getHomeStyle());
         category.setContent(HtmlSanitizer.clean(req.getContent()));
         category.setSortNo(req.getSortNo() == null ? 0 : req.getSortNo());
         category.setSeoTitle(req.getSeoTitle());
diff --git a/src/test/java/com/yunhai/cms/service/impl/CategoryServiceIT.java b/src/test/java/com/yunhai/cms/service/impl/CategoryServiceIT.java
index 7a0fc00..b8d6c24 100644
--- a/src/test/java/com/yunhai/cms/service/impl/CategoryServiceIT.java
+++ b/src/test/java/com/yunhai/cms/service/impl/CategoryServiceIT.java
@@ -71,6 +71,20 @@ class CategoryServiceIT extends CmsIntegrationTestBase {
                 .findFirst().orElseThrow(IllegalStateException::new).getHomeStyle()).isEqualTo("news_grid");
     }
 
+    @Test
+    @DisplayName("docs/20 F3：编辑不带 homeStyle 时存量值保留（入口收敛到布局编辑器后不清数据）")
+    void save_homeStylePreservedWhenAbsent() {
+        CategorySaveRequest grid = req("形态栏目", 0, 1);
+        grid.setHomeStyle("news_grid");
+        CategoryTreeNode created = categoryService.save(TestUsers.superAdmin(), grid);
+
+        // 栏目管理已不再提交 homeStyle（F3 唯一入口=首页布局编辑器）：再次保存仅改名称
+        CategorySaveRequest edit = req("形态栏目改名", 0, 1);
+        edit.setId(created.getId());
+        CategoryTreeNode updated = categoryService.save(TestUsers.superAdmin(), edit);
+        assertThat(updated.getHomeStyle()).isEqualTo("news_grid");
+    }
+
     @Test
     @DisplayName("docs/12：homeStyle 非法值被白名单拒绝")
     void save_homeStyleInvalidRejected() {