diff --git a/source/dnode/vnode/src/inc/tsdb.h b/source/dnode/vnode/src/inc/tsdb.h
index 7546b0943e..35ee8419f6 100644
--- a/source/dnode/vnode/src/inc/tsdb.h
+++ b/source/dnode/vnode/src/inc/tsdb.h
@@ -633,7 +633,7 @@ typedef struct SMergeTree {
   struct SLDataIter *pIter;
 } SMergeTree;
 
-int32_t tMergeTreeOpen(SMergeTree *pMTree, int8_t backward, SDataFReader* pFReader, uint64_t uid, STimeWindow* pTimeWindow, SVersionRange* pVerRange);
+int32_t tMergeTreeOpen(SMergeTree *pMTree, int8_t backward, SDataFReader* pFReader, uint64_t suid, uint64_t uid, STimeWindow* pTimeWindow, SVersionRange* pVerRange);
 void tMergeTreeAddIter(SMergeTree *pMTree, struct SLDataIter *pIter);
 bool tMergeTreeNext(SMergeTree *pMTree);
 TSDBROW tMergeTreeGetRow(SMergeTree *pMTree);
diff --git a/source/dnode/vnode/src/tsdb/tsdbCache.c b/source/dnode/vnode/src/tsdb/tsdbCache.c
index 64caff1542..9ac62b4b59 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCache.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCache.c
@@ -420,6 +420,7 @@ typedef enum {
 typedef struct {
   SFSLASTNEXTROWSTATES state;  // [input]
   STsdb               *pTsdb;  // [input]
+  tb_uid_t             suid;
   tb_uid_t             uid;
   int32_t              nFileSet;
   int32_t              iFileSet;
@@ -454,7 +455,7 @@ static int32_t getNextRowFromFSLast(void *iter, TSDBROW **ppRow) {
       code = tsdbDataFReaderOpen(&state->pDataFReader, state->pTsdb, pFileSet);
       if (code) goto _err;
 
-      tMergeTreeOpen(&state->mergeTree, 1, state->pDataFReader, state->uid,
+      tMergeTreeOpen(&state->mergeTree, 1, state->pDataFReader, state->suid, state->uid,
                      &(STimeWindow){.skey = TSKEY_MIN, .ekey = TSKEY_MAX},
                      &(SVersionRange){.minVer = 0, .maxVer = UINT64_MAX});
       bool hasVal = tMergeTreeNext(&state->mergeTree);
@@ -796,7 +797,7 @@ static bool tsdbKeyDeleted(TSDBKEY *key, SArray *pSkyline, int64_t *iSkyline) {
     if (key->ts > pItemBack->ts) {
       return false;
     } else if (key->ts >= pItemFront->ts && key->ts <= pItemBack->ts) {
-      if ((key->version <= pItemFront->version || key->ts == pItemBack->ts && key->version <= pItemBack->version)) {
+      if (key->version <= pItemFront->version || (key->ts == pItemBack->ts && key->version <= pItemBack->version)) {
         return true;
       } else {
         return false;
@@ -890,6 +891,7 @@ static int32_t nextRowIterOpen(CacheNextRowIter *pIter, tb_uid_t uid, STsdb *pTs
   pIter->fsLastState.state = (SFSLASTNEXTROWSTATES)SFSNEXTROW_FS;
   pIter->fsLastState.pTsdb = pTsdb;
   pIter->fsLastState.aDFileSet = pIter->pReadSnap->fs.aDFileSet;
+  pIter->fsLastState.suid = suid;
   pIter->fsLastState.uid = uid;
 
   pIter->fsState.state = SFSNEXTROW_FS;
diff --git a/source/dnode/vnode/src/tsdb/tsdbMergeTree.c b/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
index e85b136c2a..9b3f638977 100644
--- a/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
+++ b/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
@@ -42,8 +42,8 @@ static SBlockData* getNextBlock(SLDataIter* pIter) {
   return getCurrentBlock(pIter);
 }
 
-int32_t tLDataIterOpen(struct SLDataIter **pIter, SDataFReader *pReader, int32_t iSst, int8_t backward, uint64_t uid,
-                       STimeWindow *pTimeWindow, SVersionRange *pRange) {
+int32_t tLDataIterOpen(struct SLDataIter **pIter, SDataFReader *pReader, int32_t iSst, int8_t backward, uint64_t suid,
+                       uint64_t uid, STimeWindow *pTimeWindow, SVersionRange *pRange) {
   int32_t code = 0;
   *pIter = taosMemoryCalloc(1, sizeof(SLDataIter));
   if (*pIter == NULL) {
@@ -52,11 +52,11 @@ int32_t tLDataIterOpen(struct SLDataIter **pIter, SDataFReader *pReader, int32_t
   }
 
   (*pIter)->uid = uid;
-  (*pIter)->timeWindow = *pTimeWindow;
-  (*pIter)->verRange = *pRange;
-  (*pIter)->pReader = pReader;
   (*pIter)->iSst = iSst;
+  (*pIter)->pReader = pReader;
+  (*pIter)->verRange = *pRange;
   (*pIter)->backward = backward;
+  (*pIter)->timeWindow = *pTimeWindow;
   (*pIter)->aSstBlk = taosArrayInit(0, sizeof(SSstBlk));
   if ((*pIter)->aSstBlk == NULL) {
     code = TSDB_CODE_OUT_OF_MEMORY;
@@ -85,6 +85,10 @@ int32_t tLDataIterOpen(struct SLDataIter **pIter, SDataFReader *pReader, int32_t
   if (!backward) {  // asc
     for (int32_t i = 0; i < size; ++i) {
       SSstBlk *p = taosArrayGet((*pIter)->aSstBlk, i);
+      if (p->suid != suid) {
+        continue;
+      }
+
       if (p->minUid <= uid && p->maxUid >= uid) {
         index = i;
         break;
@@ -93,6 +97,10 @@ int32_t tLDataIterOpen(struct SLDataIter **pIter, SDataFReader *pReader, int32_t
   } else {  // desc
     for (int32_t i = size - 1; i >= 0; --i) {
       SSstBlk *p = taosArrayGet((*pIter)->aSstBlk, i);
+      if (p->suid != suid) {
+        continue;
+      }
+
       if (p->minUid <= uid && p->maxUid >= uid) {
         index = i;
         break;
@@ -134,9 +142,31 @@ void tLDataIterNextBlock(SLDataIter *pIter) {
       break;
     }
 
+    // check uid firstly
     if (p->minUid <= pIter->uid && p->maxUid >= pIter->uid) {
-      index = i;
-      break;
+      if ((!pIter->backward) && p->minKey > pIter->timeWindow.ekey) {
+        break;
+      }
+
+      if (pIter->backward && p->maxKey < pIter->timeWindow.skey) {
+        break;
+      }
+
+      // check time range secondly
+      if (p->minKey <= pIter->timeWindow.ekey && p->maxKey >= pIter->timeWindow.skey) {
+        if ((!pIter->backward) && p->minVer > pIter->verRange.maxVer) {
+          break;
+        }
+
+        if (pIter->backward && p->maxVer < pIter->verRange.minVer) {
+          break;
+        }
+
+        if (p->minVer <= pIter->verRange.maxVer && p->maxVer >= pIter->verRange.minVer) {
+          index = i;
+          break;
+        }
+      }
     }
   }
 
@@ -196,14 +226,6 @@ static void findNextValidRow(SLDataIter *pIter) {
       continue;
     }
 
-    //  todo handle delete soon
-#if 0
-    TSDBKEY k = {.ts = ts, .version = ver};
-        if (hasBeenDropped(pBlockScanInfo->delSkyline, &pBlockScanInfo->lastBlockDelIndex, &k, pLastBlockReader->order)) {
-          continue;
-        }
-#endif
-
     hasVal = true;
     break;
   }
@@ -294,7 +316,7 @@ static FORCE_INLINE int32_t tLDataIterCmprFn(const void *p1, const void *p2) {
   }
 }
 
-int32_t tMergeTreeOpen(SMergeTree *pMTree, int8_t backward, SDataFReader *pFReader, uint64_t uid,
+int32_t tMergeTreeOpen(SMergeTree *pMTree, int8_t backward, SDataFReader *pFReader, uint64_t suid, uint64_t uid,
                        STimeWindow *pTimeWindow, SVersionRange *pVerRange) {
   pMTree->backward = backward;
   pMTree->pIter = NULL;
@@ -308,7 +330,7 @@ int32_t tMergeTreeOpen(SMergeTree *pMTree, int8_t backward, SDataFReader *pFRead
 
   struct SLDataIter *pIterList[TSDB_DEFAULT_LAST_FILE] = {0};
   for (int32_t i = 0; i < pFReader->pSet->nSstF; ++i) {  // open all last file
-    code = tLDataIterOpen(&pIterList[i], pFReader, i, pMTree->backward, uid, pTimeWindow, pVerRange);
+    code = tLDataIterOpen(&pIterList[i], pFReader, i, pMTree->backward, suid, uid, pTimeWindow, pVerRange);
     if (code != TSDB_CODE_SUCCESS) {
       goto _end;
     }
diff --git a/source/dnode/vnode/src/tsdb/tsdbRead.c b/source/dnode/vnode/src/tsdb/tsdbRead.c
index 1828f1e40e..ad7f542368 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead.c
@@ -1934,7 +1934,7 @@ static bool initLastBlockReader(SLastBlockReader* pLastBlockReader, STableBlockS
   pLastBlockReader->uid = pBlockScanInfo->uid;
   int32_t code =
       tMergeTreeOpen(&pLastBlockReader->mergeTree, (pLastBlockReader->order == TSDB_ORDER_DESC), pReader->pFileReader,
-                     pBlockScanInfo->uid, &pLastBlockReader->window, &pLastBlockReader->verRange);
+          pReader->suid, pBlockScanInfo->uid, &pLastBlockReader->window, &pLastBlockReader->verRange);
   if (code != TSDB_CODE_SUCCESS) {
     return false;
   }
@@ -2537,22 +2537,24 @@ static int32_t buildBlockFromFiles(STsdbReader* pReader) {
         bool hasNext = blockIteratorNext(&pReader->status.blockIter);
         if (hasNext) {  // check for the next block in the block accessed order list
           initBlockDumpInfo(pReader, pBlockIter);
-        } else if (hasDataInLastBlock(pReader->status.fileIter.pLastBlockReader)) {
-          // data blocks in current file are exhausted, let's try the next file now
-          tBlockDataReset(&pReader->status.fileBlockData);
-          resetDataBlockIterator(pBlockIter, pReader->order);
-          goto _begin;
         } else {
-          code = initForFirstBlockInFile(pReader, pBlockIter);
-
-          // error happens or all the data files are completely checked
-          if ((code != TSDB_CODE_SUCCESS) || (pReader->status.loadFromFile == false)) {
-            return code;
-          }
-
-          // this file does not have blocks, let's start check the last block file
-          if (pBlockIter->numOfBlocks == 0) {
+          if (pReader->status.pCurrentFileset->nSstF > 0) {
+            // data blocks in current file are exhausted, let's try the next file now
+            tBlockDataReset(&pReader->status.fileBlockData);
+            resetDataBlockIterator(pBlockIter, pReader->order);
             goto _begin;
+          } else {
+            code = initForFirstBlockInFile(pReader, pBlockIter);
+
+            // error happens or all the data files are completely checked
+            if ((code != TSDB_CODE_SUCCESS) || (pReader->status.loadFromFile == false)) {
+              return code;
+            }
+
+            // this file does not have blocks, let's start check the last block file
+            if (pBlockIter->numOfBlocks == 0) {
+              goto _begin;
+            }
           }
         }
       }