diff --git a/src/api/mod.rs b/src/api/mod.rs
index 95b3115..635e17f 100644
--- a/src/api/mod.rs
+++ b/src/api/mod.rs
@@ -221,7 +221,7 @@ impl UGC for Post {
         self.is_deleted
     }
     fn extra_delete_condition(&self) -> bool {
-        self.n_comments == 0 && !self.content.starts_with("[系统自动代发]\n")
+        !self.content.starts_with("[系统自动代发]\n")
     }
     async fn do_set_deleted(&mut self, db: &Db) -> API<()> {
         update!(*self, posts, db, { is_deleted, to true });
diff --git a/src/api/operation.rs b/src/api/operation.rs
index f95c66b..210080a 100644
--- a/src/api/operation.rs
+++ b/src/api/operation.rs
@@ -41,7 +41,18 @@ pub async fn delete(di: Form<DeleteInput>, user: CurrentUser, db: Db, rconn: Rds
         }
         "pid" => {
             let mut p = Post::get(&db, &rconn, di.id).await?;
-            p.soft_delete(&user, &db).await?;
+
+            // 有评论：清空主楼而非删除
+            if p.author_hash == user.namehash && p.n_comments > 0 {
+                update! {
+                    p,
+                    posts,
+                    &db,
+                    { content, to "[洞主已删除]" }
+                }
+            } else {
+                p.soft_delete(&user, &db).await?;
+            }
 
             // 如果是删除，需要也从0号缓存队列中去掉
             p.refresh_cache(&rconn, true).await;