diff --git a/fe/fe-core/src/main/java/org/apache/doris/alter/AlterJobV2.java b/fe/fe-core/src/main/java/org/apache/doris/alter/AlterJobV2.java
index f0bc947ad7..e80ad312a3 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/alter/AlterJobV2.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/alter/AlterJobV2.java
@@ -194,11 +194,11 @@ public abstract class AlterJobV2 implements Writable {
             throw new AlterCancelException(e.getMessage());
         }
 
-        boolean isStable = tbl.isStable(Catalog.getCurrentSystemInfo(),
-                    Catalog.getCurrentCatalog().getTabletScheduler(), db.getClusterName());
-
         tbl.writeLock();
         try {
+            boolean isStable = tbl.isStable(Catalog.getCurrentSystemInfo(),
+                    Catalog.getCurrentCatalog().getTabletScheduler(), db.getClusterName());
+
             if (!isStable) {
                 errMsg = "table is unstable";
                 LOG.warn("wait table {} to be stable before doing {} job", tableId, type);