diff --git a/source/dnode/vnode/src/inc/tsdb.h b/source/dnode/vnode/src/inc/tsdb.h
index 2930b3b5106bb9af66c75c13f8271c9dcfe185a5..79e560df4bdb1633f66fede29c77b7498a7a85a0 100644
--- a/source/dnode/vnode/src/inc/tsdb.h
+++ b/source/dnode/vnode/src/inc/tsdb.h
@@ -710,9 +710,8 @@ typedef struct {
 
 typedef struct SSttBlockLoadInfo {
   SBlockData blockData[2];
-  void      *pBlockArray;
+  void      *pSttStatisBlkArray;
   SArray    *aSttBlk;
-  SArray    *pTombBlockArray;  // tomb block array list
   int32_t    blockIndex[2];    // to denote the loaded block in the corresponding position.
   int32_t    currentLoadBlockIndex;
   int32_t    loadBlocks;
@@ -720,10 +719,9 @@ typedef struct SSttBlockLoadInfo {
   STSchema  *pSchema;
   int16_t   *colIds;
   int32_t    numOfCols;
-  bool       checkRemainingRow;
+  bool       checkRemainingRow;  // todo: no assign value?
   bool       isLast;
   bool       sttBlockLoaded;
-  int32_t    numOfStt;
 
   // keep the last access position, this position may be used to reduce the binary times for
   // starting last block data for a new table
diff --git a/source/dnode/vnode/src/tsdb/tsdbCache.c b/source/dnode/vnode/src/tsdb/tsdbCache.c
index 29f63c4afacf225be27d53def79c9b90aa1490bc..cbb8e46b65f59cdc683c7c40291ce1d30decd65d 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCache.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCache.c
@@ -1799,10 +1799,6 @@ static int32_t loadSttTomb(STsdbReader *pTsdbReader, SSttFileReader *pSttFileRea
 
   SCacheRowsReader *pReader = (SCacheRowsReader *)pTsdbReader;
 
-  if (pLoadInfo->pTombBlockArray == NULL) {
-    pLoadInfo->pTombBlockArray = taosArrayInit(4, POINTER_BYTES);
-  }
-
   const TTombBlkArray *pBlkArray = NULL;
   code = tsdbSttFileReadTombBlk(pSttFileReader, &pBlkArray);
   if (code != TSDB_CODE_SUCCESS) {
diff --git a/source/dnode/vnode/src/tsdb/tsdbMergeTree.c b/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
index 60ba1c2b94ffd48f7676785f6cf13093cec9e70b..14c1d32b01242e2a6999593c4eda0f0d7947d47d 100644
--- a/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
+++ b/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
@@ -29,8 +29,6 @@ SSttBlockLoadInfo *tCreateLastBlockLoadInfo(STSchema *pSchema, int16_t *colList,
     return NULL;
   }
 
-  pLoadInfo->numOfStt = numOfSttTrigger;
-
   for (int32_t i = 0; i < numOfSttTrigger; ++i) {
     pLoadInfo[i].blockIndex[0] = -1;
     pLoadInfo[i].blockIndex[1] = -1;
@@ -61,7 +59,6 @@ SSttBlockLoadInfo *tCreateOneLastBlockLoadInfo(STSchema *pSchema, int16_t *colLi
     terrno = TSDB_CODE_OUT_OF_MEMORY;
     return NULL;
   }
-  pLoadInfo->numOfStt = 1;
 
   pLoadInfo->blockIndex[0] = -1;
   pLoadInfo->blockIndex[1] = -1;
@@ -78,7 +75,6 @@ SSttBlockLoadInfo *tCreateOneLastBlockLoadInfo(STSchema *pSchema, int16_t *colLi
   }
 
   pLoadInfo->aSttBlk = taosArrayInit(4, sizeof(SSttBlk));
-  pLoadInfo->pTombBlockArray = taosArrayInit(4, POINTER_BYTES);
   pLoadInfo->pSchema = pSchema;
   pLoadInfo->colIds = colList;
   pLoadInfo->numOfCols = numOfCols;
@@ -87,7 +83,7 @@ SSttBlockLoadInfo *tCreateOneLastBlockLoadInfo(STSchema *pSchema, int16_t *colLi
 }
 
 void resetLastBlockLoadInfo(SSttBlockLoadInfo *pLoadInfo) {
-  for (int32_t i = 0; i < pLoadInfo->numOfStt; ++i) {
+  for (int32_t i = 0; i < 1; ++i) {
     pLoadInfo[i].currentLoadBlockIndex = 1;
     pLoadInfo[i].blockIndex[0] = -1;
     pLoadInfo[i].blockIndex[1] = -1;
@@ -101,7 +97,7 @@ void resetLastBlockLoadInfo(SSttBlockLoadInfo *pLoadInfo) {
 }
 
 void getLastBlockLoadInfo(SSttBlockLoadInfo *pLoadInfo, int64_t *blocks, double *el) {
-  for (int32_t i = 0; i < pLoadInfo->numOfStt; ++i) {
+  for (int32_t i = 0; i < 1; ++i) {
     *el += pLoadInfo[i].elapsedTime;
     *blocks += pLoadInfo[i].loadBlocks;
   }
@@ -118,7 +114,7 @@ void *destroyLastBlockLoadInfo(SSttBlockLoadInfo *pLoadInfo) {
     return NULL;
   }
 
-  for (int32_t i = 0; i < pLoadInfo->numOfStt; ++i) {
+  for (int32_t i = 0; i < 1; ++i) {
     pLoadInfo[i].currentLoadBlockIndex = 1;
     pLoadInfo[i].blockIndex[0] = -1;
     pLoadInfo[i].blockIndex[1] = -1;
@@ -129,8 +125,6 @@ void *destroyLastBlockLoadInfo(SSttBlockLoadInfo *pLoadInfo) {
     taosArrayDestroy(pLoadInfo[i].aSttBlk);
   }
 
-  taosArrayDestroyEx(pLoadInfo->pTombBlockArray, freeTombBlock);
-
   taosMemoryFree(pLoadInfo);
   return NULL;
 }
@@ -317,8 +311,8 @@ int32_t tLDataIterOpen(struct SLDataIter *pIter, SDataFReader *pReader, int32_t
   return 0;
 }
 
-static int32_t loadSttBlockInfo(SLDataIter *pIter, SSttBlockLoadInfo *pBlockLoadInfo, uint64_t suid) {
-  TSttBlkArray *pArray = pBlockLoadInfo->pBlockArray;
+static int32_t extractSttBlockInfo(SLDataIter *pIter, const TSttBlkArray *pArray, SSttBlockLoadInfo *pBlockLoadInfo,
+                                   uint64_t suid) {
   if (TARRAY2_SIZE(pArray) <= 0) {
     return TSDB_CODE_SUCCESS;
   }
@@ -358,40 +352,52 @@ static int32_t loadSttBlockInfo(SLDataIter *pIter, SSttBlockLoadInfo *pBlockLoad
   return TSDB_CODE_SUCCESS;
 }
 
-static int32_t loadSttTombBlockData(SSttFileReader *pSttFileReader, uint64_t suid, SSttBlockLoadInfo *pLoadInfo) {
-  if (pLoadInfo->pTombBlockArray == NULL) {
-    pLoadInfo->pTombBlockArray = taosArrayInit(4, POINTER_BYTES);
-  }
+static int32_t uidComparFn(const void* p1, const void* p2) {
+  const uint64_t* uid1 = p1;
+  const uint64_t* uid2 = p2;
+  return (*uid1) - (*uid2);
+}
 
-  const TTombBlkArray *pBlkArray = NULL;
-  int32_t              code = tsdbSttFileReadTombBlk(pSttFileReader, &pBlkArray);
-  if (code != TSDB_CODE_SUCCESS) {
-    return code;
+static bool existsFromSttBlkStatis(const TStatisBlkArray *pStatisBlkArray, uint64_t suid, uint64_t uid,
+                                   SSttFileReader *pReader) {
+  if (TARRAY2_SIZE(pStatisBlkArray) <= 0) {
+    return true;
   }
 
-  for (int32_t j = 0; j < pBlkArray->size; ++j) {
-    STombBlk *pTombBlk = &pBlkArray->data[j];
-    if (pTombBlk->maxTbid.suid < suid) {
-      continue;  // todo use binary search instead
+  int32_t i = 0;
+  for (i = 0; i < TARRAY2_SIZE(pStatisBlkArray); ++i) {
+    SStatisBlk *p = &pStatisBlkArray->data[i];
+    if (p->minTbid.suid == suid) {
+      break;
     }
+  }
 
-    if (pTombBlk->minTbid.suid > suid) {
+  for (; i < TARRAY2_SIZE(pStatisBlkArray); ++i) {
+    SStatisBlk *p = &pStatisBlkArray->data[i];
+    if (p->minTbid.uid <= uid && p->maxTbid.uid >= uid) {
       break;
     }
 
-    STombBlock *pTombBlock = taosMemoryCalloc(1, sizeof(STombBlock));
-    code = tsdbSttFileReadTombBlock(pSttFileReader, pTombBlk, pTombBlock);
-    if (code != TSDB_CODE_SUCCESS) {
-      // todo handle error
+    if (p->maxTbid.uid < uid) {
+      break;
     }
+  }
 
-    void *p = taosArrayPush(pLoadInfo->pTombBlockArray, &pTombBlock);
-    if (p == NULL) {
-      return TSDB_CODE_OUT_OF_MEMORY;
-    }
+  if (i >= TARRAY2_SIZE(pStatisBlkArray)) {
+    return false;
   }
 
-  return TSDB_CODE_SUCCESS;
+  SStatisBlk    *p = &pStatisBlkArray->data[i];
+  STbStatisBlock block = {0};
+  tsdbSttFileReadStatisBlock(pReader, p, &block);
+
+  int32_t index = tarray2SearchIdx(block.uid, &uid, sizeof(int64_t), uidComparFn, TD_EQ);
+  if (index == -1) {  // has record, continue.
+    tStatisBlockDestroy(&block);
+    return false;
+  }
+
+  return true;
 }
 
 int32_t tLDataIterOpen2(struct SLDataIter *pIter, SSttFileReader *pSttFileReader, int32_t iStt, int8_t backward,
@@ -412,27 +418,45 @@ int32_t tLDataIterOpen2(struct SLDataIter *pIter, SSttFileReader *pSttFileReader
 
   if (!pBlockLoadInfo->sttBlockLoaded) {
     int64_t st = taosGetTimestampUs();
+
+    const TSttBlkArray*pSttBlkArray = NULL;
     pBlockLoadInfo->sttBlockLoaded = true;
 
-    code = tsdbSttFileReadSttBlk(pIter->pReader, (const TSttBlkArray **)&pBlockLoadInfo->pBlockArray);
+    // load the stt block info for each stt-block
+    code = tsdbSttFileReadSttBlk(pIter->pReader, &pSttBlkArray);
     if (code != TSDB_CODE_SUCCESS) {
-      tsdbError("load stt blk, code:%s, %s", tstrerror(code), idStr);
+      tsdbError("load stt blk failed, code:%s, %s", tstrerror(code), idStr);
       return code;
     }
 
-    code = loadSttBlockInfo(pIter, pBlockLoadInfo, suid);
+    code = extractSttBlockInfo(pIter, pSttBlkArray, pBlockLoadInfo, suid);
     if (code != TSDB_CODE_SUCCESS) {
       tsdbError("load stt block info failed, code:%s, %s", tstrerror(code), idStr);
       return code;
     }
 
-    code = loadTombFn(pReader1, pIter->pReader, pBlockLoadInfo);
+    // load stt blocks statis for all stt-blocks, to decide if the data of queried table exists in current stt file
+    code = tsdbSttFileReadStatisBlk(pIter->pReader, (const TStatisBlkArray **)&pBlockLoadInfo->pSttStatisBlkArray);
+    if (code != TSDB_CODE_SUCCESS) {
+      tsdbError("failed to load stt block statistics, code:%s, %s", tstrerror(code), idStr);
+      return code;
+    }
+
+    code = loadTombFn(pReader1, pIter->pReader, pIter->pBlockLoadInfo);
 
     double el = (taosGetTimestampUs() - st) / 1000.0;
-    tsdbDebug("load the last file info completed, elapsed time:%.2fms, %s", el, idStr);
+    tsdbDebug("load the stt file info completed, elapsed time:%.2fms, %s", el, idStr);
+  }
+
+  bool exists = existsFromSttBlkStatis(pBlockLoadInfo->pSttStatisBlkArray, suid, uid, pIter->pReader);
+  if (!exists) {
+    pIter->iSttBlk = -1;
+    pIter->pSttBlk = NULL;
+    return TSDB_CODE_SUCCESS;
   }
 
-  // find the start block
+  // find the start block, actually we could load the position to avoid repeatly searching for the start position when
+  // the skey is updated.
   size_t size = taosArrayGetSize(pBlockLoadInfo->aSttBlk);
   pIter->iSttBlk = binarySearchForStartBlock(pBlockLoadInfo->aSttBlk->pData, size, uid, backward);
   if (pIter->iSttBlk != -1) {
@@ -744,6 +768,7 @@ int32_t tMergeTreeOpen2(SMergeTree *pMTree, SMergeTreeConf *pConf) {
     goto _end;
   }
 
+  // add the list/iter placeholder
   while (taosArrayGetSize(pConf->pSttFileBlockIterArray) < size) {
     SArray *pList = taosArrayInit(4, POINTER_BYTES);
     taosArrayPush(pConf->pSttFileBlockIterArray, &pList);
diff --git a/source/dnode/vnode/src/tsdb/tsdbReadUtil.c b/source/dnode/vnode/src/tsdb/tsdbReadUtil.c
index 495ad9185e7993364af56fc78ca93b5e91bd4b58..635a74d8dd77f4a0e90bee9a5953c1538e8e292c 100644
--- a/source/dnode/vnode/src/tsdb/tsdbReadUtil.c
+++ b/source/dnode/vnode/src/tsdb/tsdbReadUtil.c
@@ -590,10 +590,6 @@ int32_t loadDataFileTombDataForAll(STsdbReader* pReader) {
 }
 
 int32_t loadSttTombDataForAll(STsdbReader* pReader, SSttFileReader* pSttFileReader, SSttBlockLoadInfo* pLoadInfo) {
-  if (pLoadInfo->pTombBlockArray == NULL) {
-    pLoadInfo->pTombBlockArray = taosArrayInit(4, POINTER_BYTES);
-  }
-
   const TTombBlkArray* pBlkArray = NULL;
   int32_t              code = tsdbSttFileReadTombBlk(pSttFileReader, &pBlkArray);
   if (code != TSDB_CODE_SUCCESS) {