diff --git a/par-core/src/main/java/com/par/core/service/impl/SiteSnapshotServiceImpl.java b/par-core/src/main/java/com/par/core/service/impl/SiteSnapshotServiceImpl.java
index 845850e..dfa0e75 100644
--- a/par-core/src/main/java/com/par/core/service/impl/SiteSnapshotServiceImpl.java
+++ b/par-core/src/main/java/com/par/core/service/impl/SiteSnapshotServiceImpl.java
@@ -138,6 +138,9 @@ public class SiteSnapshotServiceImpl implements SiteSnapshotService {
 
             int newVersion = snapshotMapper.selectMaxVersion(siteId) + 1;
 
+            // 清理旧 draft（确保一个站点最多一个预览版）
+            snapshotMapper.deleteBySiteIdAndStatus(siteId, "draft");
+
             SiteSnapshot snapshot = new SiteSnapshot();
             snapshot.setSiteId(siteId);
             snapshot.setVersion(newVersion);
@@ -181,6 +184,9 @@ public class SiteSnapshotServiceImpl implements SiteSnapshotService {
 
             int newVersion = snapshotMapper.selectMaxVersion(siteId) + 1;
 
+            // 清理旧 draft（确保一个站点最多一个预览版）
+            snapshotMapper.deleteBySiteIdAndStatus(siteId, "draft");
+
             SiteSnapshot snapshot = new SiteSnapshot();
             snapshot.setSiteId(siteId);
             snapshot.setVersion(newVersion);