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 0596067..26076ee 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
@@ -134,11 +134,12 @@ public class SiteSnapshotServiceImpl implements SiteSnapshotService {
                 return null;
             }
 
-            int newVersion = (latestDraft != null) ? latestDraft.getVersion() + 1 : 1;
+            // 删除旧 draft，保证最新只有一条
+            snapshotMapper.deleteBySiteIdAndStatus(siteId, "draft");
 
             SiteSnapshot snapshot = new SiteSnapshot();
             snapshot.setSiteId(siteId);
-            snapshot.setVersion(newVersion);
+            snapshot.setVersion((latestDraft != null) ? latestDraft.getVersion() + 1 : 1);
             populateSnapshotFields(snapshot, data);
             snapshot.setChecksum(checksum);
             snapshot.setStatus("draft");
@@ -149,7 +150,7 @@ public class SiteSnapshotServiceImpl implements SiteSnapshotService {
             String bundleJson = toBundleJson(snapshot);
             jsonCache.put(draftKey(siteId), bundleJson);
 
-            log.info("快照已更新: siteId={}, version={}, checksum={}", siteId, newVersion, checksum.substring(0, 8));
+            log.info("快照已更新: siteId={}, version={}, checksum={}", siteId, snapshot.getVersion(), checksum.substring(0, 8));
             return snapshot;
         } catch (Exception e) {
             log.error("更新快照失败 siteId={}", siteId, e);
@@ -177,11 +178,12 @@ public class SiteSnapshotServiceImpl implements SiteSnapshotService {
                 return latestDraft;
             }
 
-            int newVersion = (latestDraft != null) ? latestDraft.getVersion() + 1 : 1;
+            // 删除旧 draft，保证最新只有一条
+            snapshotMapper.deleteBySiteIdAndStatus(siteId, "draft");
 
             SiteSnapshot snapshot = new SiteSnapshot();
             snapshot.setSiteId(siteId);
-            snapshot.setVersion(newVersion);
+            snapshot.setVersion((latestDraft != null) ? latestDraft.getVersion() + 1 : 1);
             populateSnapshotFields(snapshot, data);
             snapshot.setChecksum(checksum);
             snapshot.setStatus("draft");
@@ -192,7 +194,7 @@ public class SiteSnapshotServiceImpl implements SiteSnapshotService {
             String bundleJson = toBundleJson(snapshot);
             jsonCache.put(draftKey(siteId), bundleJson);
 
-            log.info("预览版已保存: siteId={}, version={}, checksum={}", siteId, newVersion, checksum.substring(0, 8));
+            log.info("预览版已保存: siteId={}, version={}, checksum={}", siteId, snapshot.getVersion(), checksum.substring(0, 8));
             return snapshot;
         } catch (Exception e) {
             log.error("保存预览版失败 siteId={}", siteId, e);
@@ -234,7 +236,8 @@ public class SiteSnapshotServiceImpl implements SiteSnapshotService {
             return current;
         }
 
-        // 更新状态为 published
+        // 先删旧 published，再改当前 draft 为 published（事务保证原子性）
+        snapshotMapper.deleteBySiteIdAndStatus(siteId, "published");
         draft.setStatus("published");
         draft.setPublishedAt(LocalDateTime.now());
         snapshotMapper.updateById(draft);