diff --git a/fe/fe-core/src/main/java/org/apache/doris/cloud/transaction/CloudGlobalTransactionMgr.java b/fe/fe-core/src/main/java/org/apache/doris/cloud/transaction/CloudGlobalTransactionMgr.java
index aff9458f73bda3..59c73e5b8f8ab1 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/cloud/transaction/CloudGlobalTransactionMgr.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/cloud/transaction/CloudGlobalTransactionMgr.java
@@ -425,6 +425,8 @@ public void commitTransactionWithoutLock(long dbId, List<Table> tableList, long
             }
             commitTransactionWithoutLock(dbId, tableList, transactionId, tabletCommitInfos, txnCommitAttachment, false,
                     mowTableList, backendToPartitionInfos);
+            // clear signature after commit succeeds
+            clearTxnLastSignature(dbId, transactionId);
         } catch (Exception e) {
             if (!mowTableList.isEmpty()) {
                 LOG.warn("commit txn {} failed, release delete bitmap lock, catch exception {}", transactionId,
@@ -1491,6 +1493,8 @@ public boolean commitAndPublishTransaction(DatabaseIf db, long transactionId,
             }
             commitTransactionWithSubTxns(db.getId(), tableList, transactionId, subTransactionStates, mowTableList,
                     backendToPartitionInfos);
+            // clear signature after commit succeeds
+            clearTxnLastSignature(db.getId(), transactionId);
         } catch (Exception e) {
             if (!mowTableList.isEmpty()) {
                 LOG.warn("commit txn {} failed, release delete bitmap lock, catch exception {}", transactionId,
@@ -1671,6 +1675,8 @@ public boolean commitAndPublishTransaction(DatabaseIf db, List<Table> tableList,
         beforeCommitTransaction(tableList, transactionId, timeoutMillis);
         try {
             commitTransactionWithoutLock(db.getId(), tableList, transactionId, tabletCommitInfos, txnCommitAttachment);
+            // Only clear signature after commit succeeds, as BE may retry on failure
+            clearTxnLastSignature(db.getId(), transactionId);
         } finally {
             stopWatch.stop();
             long costTimeMs = stopWatch.getTime();
@@ -1738,6 +1744,7 @@ public void abortTransaction(Long dbId, Long transactionId, String reason,
             abortTxnResponse = abortTransactionImpl(dbId, transactionId, reason, null);
         } finally {
             handleAfterAbort(abortTxnResponse, txnCommitAttachment, transactionId);
+            clearTxnLastSignature(dbId, transactionId);
         }
     }