diff --git a/include/libs/stream/streamState.h b/include/libs/stream/streamState.h
index 7c4aab2491..ae84299c1c 100644
--- a/include/libs/stream/streamState.h
+++ b/include/libs/stream/streamState.h
@@ -65,6 +65,7 @@ void          streamStateClose(SStreamState* pState);
 int32_t       streamStateBegin(SStreamState* pState);
 int32_t       streamStateCommit(SStreamState* pState);
 void          streamStateDestroy(SStreamState* pState);
+int32_t       streamStateDeleteCheckPoint(SStreamState* pState, TSKEY mark);
 
 typedef struct {
   rocksdb_iterator_t*    iter;
diff --git a/include/libs/stream/tstreamFileState.h b/include/libs/stream/tstreamFileState.h
index 4f2618f8dc..25267be354 100644
--- a/include/libs/stream/tstreamFileState.h
+++ b/include/libs/stream/tstreamFileState.h
@@ -54,7 +54,7 @@ int32_t          flushSnapshot(SStreamFileState* pFileState, SStreamSnapshot* pS
 int32_t          recoverSnapshot(SStreamFileState* pFileState);
 
 int32_t getSnapshotIdList(SStreamFileState* pFileState, SArray* list);
-int32_t forceRemoveCheckpoint(SStreamFileState* pFileState, int64_t checkpointId);
+int32_t deleteExpiredCheckPoint(SStreamFileState* pFileState, TSKEY mark);
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index 0ad2423ca3..86f78989d1 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -2151,7 +2151,7 @@ FETCH_NEXT_BLOCK:
     // record the scan action.
     pInfo->numOfExec++;
     pOperator->resultInfo.totalRows += pBlockInfo->rows;
-    // printDataBlock(pInfo->pRes, "stream scan");
+    printDataBlock(pInfo->pRes, "stream scan");
 
     qDebug("scan rows: %" PRId64, pBlockInfo->rows);
     if (pBlockInfo->rows > 0) {
diff --git a/source/libs/executor/src/timewindowoperator.c b/source/libs/executor/src/timewindowoperator.c
index eb7c605d69..811194031b 100644
--- a/source/libs/executor/src/timewindowoperator.c
+++ b/source/libs/executor/src/timewindowoperator.c
@@ -1454,10 +1454,6 @@ STimeWindow getFinalTimeWindow(int64_t ts, SInterval* pInterval) {
   return w;
 }
 
-static void deleteIntervalDiscBuf(SStreamState* pState, TSKEY mark) {
-  //todo(liuyao) delete expired check point
-}
-
 static void closeChildIntervalWindow(SOperatorInfo* pOperator, SArray* pChildren, TSKEY maxTs) {
   int32_t size = taosArrayGetSize(pChildren);
   for (int32_t i = 0; i < size; i++) {
@@ -2404,6 +2400,7 @@ static void doStreamIntervalAggImpl(SOperatorInfo* pOperatorInfo, SSDataBlock* p
   STimeWindow nextWin = {0};
   if (IS_FINAL_OP(pInfo)) {
     nextWin = getFinalTimeWindow(ts, &pInfo->interval);
+    qDebug("===stream===final ts:%" PRId64 ", getFinalTimeWindow:%" PRId64,ts, nextWin.skey);
   } else {
     nextWin = getActiveTimeWindow(pInfo->aggSup.pResultBuf, pResultRowInfo, ts, &pInfo->interval, TSDB_ORDER_ASC);
   }
@@ -2448,14 +2445,17 @@ static void doStreamIntervalAggImpl(SOperatorInfo* pOperatorInfo, SSDataBlock* p
       }
 
       if (ignore) {
-        startPos = getNexWindowPos(&pInfo->interval, &pSDataBlock->info, tsCols, startPos, nextWin.ekey, &nextWin);
+        // startPos = getNexWindowPos(&pInfo->interval, &pSDataBlock->info, tsCols, startPos, nextWin.ekey, &nextWin);
+        int32_t prevEndPos = startPos;
+        startPos = getNextQualifiedFinalWindow(&pInfo->interval, &nextWin, &pSDataBlock->info, tsCols, prevEndPos);
         if (startPos < 0) {
           break;
         }
         continue;
       }
     }
-
+    
+    qDebug("===stream===final setIntervalOutputBuf:%" PRId64, nextWin.skey);
     int32_t code = setIntervalOutputBuf(pInfo->pState, &nextWin, &pResPos, groupId, pSup->pCtx, numOfOutput,
                                         pSup->rowEntryInfoOffset, &pInfo->aggSup);
     pResult = (SResultRow*)pResPos->pRowBuff;
@@ -2474,6 +2474,7 @@ static void doStreamIntervalAggImpl(SOperatorInfo* pOperatorInfo, SSDataBlock* p
         .groupId = groupId,
     };
     if (pInfo->twAggSup.calTrigger == STREAM_TRIGGER_AT_ONCE && pUpdatedMap) {
+       qDebug("===stream===is final%d saveWinResult:%" PRId64,  IS_FINAL_OP(pInfo), key.ts);
       saveWinResult(&key, pResPos, pUpdatedMap);
     }
 
@@ -2575,9 +2576,9 @@ static SSDataBlock* doStreamFinalIntervalAgg(SOperatorInfo* pOperator) {
       setStreamDataVersion(pTaskInfo, pInfo->dataVersion, pInfo->pState->checkPointId);
       qDebug("===stream===clear semi operator");
     } else {
-      deleteIntervalDiscBuf(pInfo->pState, pInfo->twAggSup.maxTs - pInfo->twAggSup.deleteMark);
       if (pInfo->twAggSup.maxTs - pInfo->twAggSup.checkPointInterval > pInfo->twAggSup.checkPointTs) {
         streamStateCommit(pInfo->pState);
+        streamStateDeleteCheckPoint(pInfo->pState, pInfo->twAggSup.maxTs - pInfo->twAggSup.deleteMark);
         pInfo->twAggSup.checkPointTs = pInfo->twAggSup.maxTs;
       }
       qDebug("===stream===interval final close");
@@ -4813,10 +4814,10 @@ static SSDataBlock* doStreamIntervalAgg(SOperatorInfo* pOperator) {
       printDataBlock(pInfo->binfo.pRes, "single interval");
       return pInfo->binfo.pRes;
     }
-    deleteIntervalDiscBuf(pInfo->pState, pInfo->twAggSup.maxTs - pInfo->twAggSup.deleteMark);
     setOperatorCompleted(pOperator);
     if (pInfo->twAggSup.maxTs - pInfo->twAggSup.checkPointInterval > pInfo->twAggSup.checkPointTs) {
       streamStateCommit(pInfo->pState);
+      streamStateDeleteCheckPoint(pInfo->pState, pInfo->twAggSup.maxTs - pInfo->twAggSup.deleteMark);
       setStreamDataVersion(pTaskInfo, pInfo->dataVersion, pInfo->pState->checkPointId);
       pInfo->twAggSup.checkPointTs = pInfo->twAggSup.maxTs;
     }
diff --git a/source/libs/stream/src/streamState.c b/source/libs/stream/src/streamState.c
index cee72002da..85b176c684 100644
--- a/source/libs/stream/src/streamState.c
+++ b/source/libs/stream/src/streamState.c
@@ -1072,6 +1072,14 @@ void streamStateDestroy(SStreamState* pState) {
   taosMemoryFreeClear(pState);
 }
 
+int32_t streamStateDeleteCheckPoint(SStreamState* pState, TSKEY mark) {
+#ifdef USE_ROCKSDB
+  return deleteExpiredCheckPoint(pState->pFileState, mark);
+#else
+  return 0;
+#endif
+}
+
 #if 0
 char* streamStateSessionDump(SStreamState* pState) {
   SStreamStateCur* pCur = taosMemoryCalloc(1, sizeof(SStreamStateCur));
diff --git a/source/libs/stream/src/tstreamFileState.c b/source/libs/stream/src/tstreamFileState.c
index eab95d1214..88fdfb6b3c 100644
--- a/source/libs/stream/src/tstreamFileState.c
+++ b/source/libs/stream/src/tstreamFileState.c
@@ -372,17 +372,20 @@ int32_t flushSnapshot(SStreamFileState* pFileState, SStreamSnapshot* pSnapshot,
 
   return code;
 }
+
 int32_t forceRemoveCheckpoint(SStreamFileState* pFileState, int64_t checkpointId) {
   const char* taskKey = "streamFileState";
   char        keyBuf[128] = {0};
   sprintf(keyBuf, "%s:%" PRId64 "", taskKey, checkpointId);
   return streamDefaultDel_rocksdb(pFileState->pFileStore, keyBuf);
 }
+
 int32_t getSnapshotIdList(SStreamFileState* pFileState, SArray* list) {
   const char* taskKey = "streamFileState";
   return streamDefaultIter_rocksdb(pFileState->pFileStore, taskKey, NULL, list);
 }
-int32_t recoverSnapshot(SStreamFileState* pFileState) {
+
+int32_t deleteExpiredCheckPoint(SStreamFileState* pFileState, TSKEY mark) {
   int32_t     code = TSDB_CODE_SUCCESS;
   const char* taskKey = "streamFileState";
   int64_t     maxCheckPointId = 0;
@@ -410,13 +413,18 @@ int32_t recoverSnapshot(SStreamFileState* pFileState) {
     TSKEY ts;
     sscanf(val, "%" PRId64 "", &ts);
     taosMemoryFree(val);
-    if (ts < pFileState->deleteMark) {
+    if (ts < mark) {
       forceRemoveCheckpoint(pFileState, i);
       break;
     } else {
     }
   }
+  return code;
+}
 
+int32_t recoverSnapshot(SStreamFileState* pFileState) {
+  int32_t code = TSDB_CODE_SUCCESS;
+  deleteExpiredCheckPoint(pFileState, pFileState->maxTs - pFileState->deleteMark);
   void*   pStVal = NULL;
   int32_t len = 0;