diff --git a/par-core/src/main/java/com/par/core/mapper/SiteSnapshotMapper.java b/par-core/src/main/java/com/par/core/mapper/SiteSnapshotMapper.java
index 2a9706c..57b4f34 100644
--- a/par-core/src/main/java/com/par/core/mapper/SiteSnapshotMapper.java
+++ b/par-core/src/main/java/com/par/core/mapper/SiteSnapshotMapper.java
@@ -27,4 +27,8 @@ public interface SiteSnapshotMapper extends BaseMapper<SiteSnapshot> {
     /** 删除站点指定状态的快照 */
     @org.apache.ibatis.annotations.Delete("DELETE FROM site_snapshots WHERE site_id = #{siteId} AND status = #{status}")
     int deleteBySiteIdAndStatus(@Param("siteId") String siteId, @Param("status") String status);
+
+    /** 取站点快照的最大版本号 */
+    @Select("SELECT COALESCE(MAX(version), 0) FROM site_snapshots WHERE site_id = #{siteId}")
+    int selectMaxVersion(@Param("siteId") String siteId);
 }
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 2d737a3..845850e 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
@@ -136,7 +136,7 @@ public class SiteSnapshotServiceImpl implements SiteSnapshotService {
                 return null;
             }
 
-            int newVersion = (latestDraft != null) ? latestDraft.getVersion() + 1 : 1;
+            int newVersion = snapshotMapper.selectMaxVersion(siteId) + 1;
 
             SiteSnapshot snapshot = new SiteSnapshot();
             snapshot.setSiteId(siteId);
@@ -179,7 +179,7 @@ public class SiteSnapshotServiceImpl implements SiteSnapshotService {
                 return latestDraft;
             }
 
-            int newVersion = (latestDraft != null) ? latestDraft.getVersion() + 1 : 1;
+            int newVersion = snapshotMapper.selectMaxVersion(siteId) + 1;
 
             SiteSnapshot snapshot = new SiteSnapshot();
             snapshot.setSiteId(siteId);