diff --git a/src/vnode/tsdb/inc/tsdbFile.h b/src/vnode/tsdb/inc/tsdbFile.h
index 8c106d1067f92d9eabcb3dbf8eb89081a93f015a..0c85c5ef46548df5fd6d1d5866c2ddff411040a7 100644
--- a/src/vnode/tsdb/inc/tsdbFile.h
+++ b/src/vnode/tsdb/inc/tsdbFile.h
@@ -20,6 +20,7 @@
 #include "dataformat.h"
 #include "taosdef.h"
 #include "tglobalcfg.h"
+#include "tsdb.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -148,6 +149,8 @@ typedef struct {
   SCompCol cols[];
 } SCompData;
 
+STsdbFileH* tsdbGetFile(tsdb_repo_t* pRepo);
+
 int tsdbCopyBlockDataInFile(SFile *pOutFile, SFile *pInFile, SCompInfo *pCompInfo, int idx, int isLast, SDataCols *pCols);
 
 int tsdbLoadCompIdx(SFileGroup *pGroup, void *buf, int maxTables);
diff --git a/src/vnode/tsdb/src/tsdbMain.c b/src/vnode/tsdb/src/tsdbMain.c
index c45a8407cc1216f17bd74a57ce3e80f31ccf5464..b1a531455dcd15ba4510d4e6e4ada75e66c51f15 100644
--- a/src/vnode/tsdb/src/tsdbMain.c
+++ b/src/vnode/tsdb/src/tsdbMain.c
@@ -551,6 +551,11 @@ STsdbMeta* tsdbGetMeta(tsdb_repo_t* pRepo) {
   return tsdb->tsdbMeta;
 }
 
+STsdbFileH* tsdbGetFile(tsdb_repo_t* pRepo) {
+  STsdbRepo* tsdb = (STsdbRepo*) pRepo;
+  return tsdb->tsdbFileH;
+}
+
 // Check the configuration and set default options
 static int32_t tsdbCheckAndSetDefaultCfg(STsdbCfg *pCfg) {
   // Check precision
diff --git a/src/vnode/tsdb/src/tsdbRead.c b/src/vnode/tsdb/src/tsdbRead.c
index 7b996c8f7a170fdf278c1cb844ca85686f65fa6a..3ed6e22ad8874e27313f95ca4c7f8919a14de66f 100644
--- a/src/vnode/tsdb/src/tsdbRead.c
+++ b/src/vnode/tsdb/src/tsdbRead.c
@@ -13,8 +13,9 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <tlog.h>
 #include "os.h"
+
+#include "tlog.h"
 #include "tutil.h"
 
 #include "../../../query/inc/qast.h"
@@ -28,6 +29,11 @@
 #define QUERY_IS_ASC_QUERY(o) (o == TSQL_SO_ASC)
 #define QH_GET_NUM_OF_COLS(handle) (taosArrayGetSize((handle)->pColumns))
 
+enum {
+  QUERY_RANGE_LESS_EQUAL = 0,
+  QUERY_RANGE_GREATER_EQUAL = 1,
+};
+
 typedef struct SField {
   // todo need the definition
 } SField;
@@ -36,12 +42,12 @@ typedef struct SHeaderFileInfo {
   int32_t fileId;
 } SHeaderFileInfo;
 
-typedef struct SQueryHandlePos {
-  int32_t fileId;
+typedef struct SQueryFilePos {
+  int32_t fid;
   int32_t slot;
   int32_t pos;
-  int32_t fileIndex;
-} SQueryHandlePos;
+  int64_t lastKey;
+} SQueryFilePos;
 
 typedef struct SDataBlockLoadInfo {
   int32_t fileListIndex;
@@ -78,8 +84,12 @@ typedef struct STableCheckInfo {
   TSKEY       lastKey;
   STable *    pTableObj;
   int64_t     offsetInHeaderFile;
-  int32_t     numOfBlocks;
+//  int32_t     numOfBlocks;
   int32_t     start;
+  bool        checkFirstFileBlock;
+  
+  SCompIdx*   compIndex;
+  
   SCompBlock *pBlock;
   SSkipListIterator* iter;
 } STableCheckInfo;
@@ -104,8 +114,8 @@ enum {
 typedef struct STsdbQueryHandle {
   struct STsdbRepo* pTsdb;
   int8_t          model;  // access model, single table model or multi-table model
-  SQueryHandlePos cur;    // current position
-  SQueryHandlePos start;  // the start position, used for secondary/third iteration
+  SQueryFilePos cur;    // current position
+  SQueryFilePos start;  // the start position, used for secondary/third iteration
   int32_t         unzipBufSize;
   char           *unzipBuffer;
   char           *secondaryUnzipBuffer;
@@ -342,6 +352,344 @@ static bool hasMoreDataInCacheForSingleModel(STsdbQueryHandle* pHandle) {
   return true;
 }
 
+// todo dynamic get the daysperfile
+static int32_t getFileIdFromKey(TSKEY key) {
+  return (int32_t)(key / 10); // set the starting fileId
+}
+
+static int32_t getFileCompInfo(STableCheckInfo* pCheckInfo, SFileGroup* fileGroup) {
+  tsdbLoadCompIdx(fileGroup, pCheckInfo->compIndex, 10000); // todo set dynamic max tables
+  SCompIdx* compIndex = &pCheckInfo->compIndex[pCheckInfo->tableId.tid];
+  
+  if (compIndex->len == 0 || compIndex->numOfSuperBlocks == 0) {  // no data block in this file, try next file
+    
+  } else {
+    tsdbLoadCompBlocks(fileGroup, compIndex, pCheckInfo->pBlock);
+  }
+  
+  return TSDB_CODE_SUCCESS;
+}
+
+static int32_t binarySearchForBlockImpl(SCompBlock *pBlock, int32_t numOfBlocks, TSKEY skey, int32_t order) {
+  int32_t firstSlot = 0;
+  int32_t lastSlot = numOfBlocks - 1;
+  
+  int32_t midSlot = firstSlot;
+  
+  while (1) {
+    numOfBlocks = lastSlot - firstSlot + 1;
+    midSlot = (firstSlot + (numOfBlocks >> 1));
+    
+    if (numOfBlocks == 1) break;
+    
+    if (skey > pBlock[midSlot].keyLast) {
+      if (numOfBlocks == 2) break;
+      if ((order == TSQL_SO_DESC) && (skey < pBlock[midSlot + 1].keyFirst)) break;
+      firstSlot = midSlot + 1;
+    } else if (skey < pBlock[midSlot].keyFirst) {
+      if ((order == TSQL_SO_ASC) && (skey > pBlock[midSlot - 1].keyLast)) break;
+      lastSlot = midSlot - 1;
+    } else {
+      break;  // got the slot
+    }
+  }
+  
+  return midSlot;
+}
+
+static SDataBlockInfo getTrueBlockInfo(STsdbQueryHandle* pHandle, STableCheckInfo* pCheckInfo) {
+  SDataBlockInfo info = {{0}, 0};
+  
+  SCompBlock *pDiskBlock = &pCheckInfo->pBlock[pHandle->cur.slot];
+  
+  info.window.skey = pDiskBlock->keyFirst;
+  info.window.ekey = pDiskBlock->keyLast;
+  info.size = pDiskBlock->numOfPoints;
+  info.numOfCols = pDiskBlock->numOfCols;
+  
+  return info;
+}
+
+bool moveToNextBlock(STsdbQueryHandle *pQueryHandle, int32_t step) {
+  SQueryFilePos *cur = &pQueryHandle->cur;
+  
+  if (pQueryHandle->cur.fid >= 0) {
+    int32_t fileIndex = -1;
+    
+    /*
+     * 1. ascending  order. The last data block of data file
+     * 2. descending order. The first block of file
+     */
+    if ((step == QUERY_ASC_FORWARD_STEP && (pQueryHandle->cur.slot == pQueryHandle->numOfBlocks - 1)) ||
+        (step == QUERY_DESC_FORWARD_STEP && (pQueryHandle->cur.slot == 0))) {
+      // temporarily keep the position value, in case of no data qualified when move forwards(backwards)
+      SQueryFilePos save = pQueryHandle->cur;
+      
+//      fileIndex = getNextDataFileCompInfo_(pQueryHandle, &pQueryHandle->cur, &pQueryHandle->vnodeFileInfo, step);
+      
+      // first data block in the next file
+      if (fileIndex >= 0) {
+        cur->slot = (step == QUERY_ASC_FORWARD_STEP) ? 0 : pQueryHandle->numOfBlocks - 1;
+        cur->pos = (step == QUERY_ASC_FORWARD_STEP) ? 0 : pQueryHandle->pBlock[cur->slot].numOfPoints - 1;
+//        return loadQaulifiedData(pQueryHandle);
+      } else {// try data in cache
+        assert(cur->fid == -1);
+        
+        if (step == QUERY_ASC_FORWARD_STEP) {
+//          TSKEY nextTimestamp =
+//              getQueryStartPositionInCache_rv(pQueryHandle, &pQueryHandle->cur.slot, &pQueryHandle->cur.pos, true);
+//          if (nextTimestamp < 0) {
+//            pQueryHandle->cur = save;
+//          }
+          
+//          return (nextTimestamp > 0);
+        }
+        
+        // no data to check for desc order query, restore the saved position value
+        pQueryHandle->cur = save;
+        return false;
+      }
+    }
+    
+    // next block in the same file
+    int32_t fid = cur->fid;
+//    fileIndex = vnodeGetVnodeHeaderFileIndex(&fid, pQueryHandle->order, &pQueryHandle->vnodeFileInfo);
+    cur->slot += step;
+    
+    SCompBlock *pBlock = &pQueryHandle->pBlock[cur->slot];
+    cur->pos = (step == QUERY_ASC_FORWARD_STEP) ? 0 : pBlock->numOfPoints - 1;
+//    return loadQaulifiedData(pQueryHandle);
+  } else {  // data in cache
+//    todo continue;
+  }
+}
+
+
+int vnodeBinarySearchKey(char *pValue, int num, TSKEY key, int order) {
+  int    firstPos, lastPos, midPos = -1;
+  int    numOfPoints;
+  TSKEY *keyList;
+  
+  if (num <= 0) return -1;
+  
+  keyList = (TSKEY *)pValue;
+  firstPos = 0;
+  lastPos = num - 1;
+  
+  if (order == 0) {
+    // find the first position which is smaller than the key
+    while (1) {
+      if (key >= keyList[lastPos]) return lastPos;
+      if (key == keyList[firstPos]) return firstPos;
+      if (key < keyList[firstPos]) return firstPos - 1;
+      
+      numOfPoints = lastPos - firstPos + 1;
+      midPos = (numOfPoints >> 1) + firstPos;
+      
+      if (key < keyList[midPos]) {
+        lastPos = midPos - 1;
+      } else if (key > keyList[midPos]) {
+        firstPos = midPos + 1;
+      } else {
+        break;
+      }
+    }
+    
+  } else {
+    // find the first position which is bigger than the key
+    while (1) {
+      if (key <= keyList[firstPos]) return firstPos;
+      if (key == keyList[lastPos]) return lastPos;
+      
+      if (key > keyList[lastPos]) {
+        lastPos = lastPos + 1;
+        if (lastPos >= num)
+          return -1;
+        else
+          return lastPos;
+      }
+      
+      numOfPoints = lastPos - firstPos + 1;
+      midPos = (numOfPoints >> 1) + firstPos;
+      
+      if (key < keyList[midPos]) {
+        lastPos = midPos - 1;
+      } else if (key > keyList[midPos]) {
+        firstPos = midPos + 1;
+      } else {
+        break;
+      }
+    }
+  }
+  
+  return midPos;
+}
+
+static void filterDataInDataBlock(STsdbQueryHandle *pQueryHandle, SArray *sa) {
+  // only return the qualified data to client in terms of query time window, data rows in the same block but do not
+  // be included in the query time window will be discarded
+  SQueryFilePos *cur = &pQueryHandle->cur;
+  STableCheckInfo* pCheckInfo = taosArrayGet(pQueryHandle->pTableCheckInfo, pQueryHandle->activeIndex);
+  SDataBlockInfo blockInfo = getTrueBlockInfo(pQueryHandle, pCheckInfo);
+  
+  int32_t endPos = cur->pos;
+  if (QUERY_IS_ASC_QUERY(pQueryHandle->order) && pQueryHandle->window.ekey > blockInfo.window.ekey) {
+    endPos = blockInfo.size - 1;
+    pQueryHandle->realNumOfRows = endPos - cur->pos + 1;
+  } else if (!QUERY_IS_ASC_QUERY(pQueryHandle->order) && pQueryHandle->window.ekey < blockInfo.window.skey) {
+    endPos = 0;
+    pQueryHandle->realNumOfRows = cur->pos + 1;
+  } else {
+//    endPos = vnodeBinarySearchKey(pQueryHandle->tsBuf->data, blockInfo.size, pQueryHandle->window.ekey, pQueryHandle->order);
+    
+    if (QUERY_IS_ASC_QUERY(pQueryHandle->order)) {
+      if (endPos < cur->pos) {
+        pQueryHandle->realNumOfRows = 0;
+        return;
+      } else {
+        pQueryHandle->realNumOfRows = endPos - cur->pos;
+      }
+    } else {
+      if (endPos > cur->pos) {
+        pQueryHandle->realNumOfRows = 0;
+        return;
+      } else {
+        pQueryHandle->realNumOfRows = cur->pos - endPos;
+      }
+    }
+  }
+  
+  int32_t start = MIN(cur->pos, endPos);
+  
+  // move the data block in the front to data block if needed
+  if (start != 0) {
+    int32_t numOfCols = QH_GET_NUM_OF_COLS(pQueryHandle);
+    
+    for (int32_t i = 0; i < taosArrayGetSize(sa); ++i) {
+      int16_t colId = *(int16_t *)taosArrayGet(sa, i);
+      
+      for (int32_t j = 0; j < numOfCols; ++j) {
+        SColumnInfoEx *pCol = taosArrayGet(pQueryHandle->pColumns, j);
+        
+        if (pCol->info.colId == colId) {
+          memmove(pCol->pData, ((char *)pCol->pData) + pCol->info.bytes * start, pQueryHandle->realNumOfRows * pCol->info.bytes);
+          break;
+        }
+      }
+    }
+  }
+  
+  
+  
+  assert(pQueryHandle->realNumOfRows <= blockInfo.size);
+  
+  // forward(backward) the position for cursor
+  cur->pos = endPos;
+}
+
+static bool getQualifiedDataBlock(STsdbQueryHandle *pQueryHandle, STableCheckInfo* pCheckInfo, int32_t type) {
+  STsdbFileH* pFileHandle = tsdbGetFile(pQueryHandle->pTsdb);
+  int32_t fid = getFileIdFromKey(pCheckInfo->lastKey);
+  
+  SFileGroup* fileGroup = tsdbSearchFGroup(pFileHandle, fid);
+  pCheckInfo->checkFirstFileBlock = true;
+  
+  SQueryFilePos* cur = &pQueryHandle->cur;
+
+  TSKEY key = pCheckInfo->lastKey;
+  int32_t index = -1;
+
+  // todo add iterator for filegroup
+  while (1) {
+    if ((fid = getFileCompInfo(pCheckInfo, fileGroup)) < 0) {
+      break;
+    }
+    
+    int32_t tid = pCheckInfo->tableId.tid;
+    index = binarySearchForBlockImpl(pCheckInfo->pBlock, pCheckInfo->compIndex[tid].numOfSuperBlocks, pQueryHandle->order, key);
+    
+    if (type == QUERY_RANGE_GREATER_EQUAL) {
+      if (key <= pCheckInfo->pBlock[index].keyLast) {
+        break;
+      } else {
+        index = -1;
+      }
+    } else {
+      if (key >= pCheckInfo->pBlock[index].keyFirst) {
+        break;
+      } else {
+        index = -1;
+      }
+    }
+  }
+  
+  // failed to find qualified point in file, abort
+  if (index == -1) {
+    return false;
+  }
+  
+  assert(index >= 0 && index < pQueryHandle->numOfBlocks);
+  
+  // load first data block into memory failed, caused by disk block error
+  bool    blockLoaded = false;
+  SArray *sa = NULL;
+  
+  // todo no need to loaded at all
+  cur->slot = index;
+    
+//    sa = getDefaultLoadColumns(pQueryHandle, true);
+    if (tsdbLoadDataBlock(&fileGroup->files[2], &pCheckInfo->pBlock[cur->slot], 1, fid, sa) == 0) {
+      blockLoaded = true;
+    }
+    
+    //    dError("QInfo:%p fileId:%d total numOfBlks:%d blockId:%d load into memory failed due to error in disk files",
+    //           GET_QINFO_ADDR(pQuery), pQuery->fileId, pQuery->numOfBlocks, blkIdx);
+  
+  // failed to load data from disk, abort current query
+  if (blockLoaded == false) {
+    return false;
+  }
+  
+  // todo search qualified points in blk, according to primary key (timestamp) column
+//  cur->pos = binarySearchForBlockImpl(ptsBuf->data, pBlocks->numOfPoints, key, pQueryHandle->order);
+  assert(cur->pos >= 0 && cur->fid >= 0 && cur->slot >= 0);
+  
+  filterDataInDataBlock(pQueryHandle, sa);
+  return pQueryHandle->realNumOfRows > 0;
+}
+
+static bool hasMoreDataInFileForSingleTableModel(STsdbQueryHandle* pHandle) {
+  assert(pHandle->activeIndex == 0 && taosArrayGetSize(pHandle->pTableCheckInfo) == 1);
+  STsdbFileH* pFileHandle = tsdbGetFile(pHandle->pTsdb);
+  SQueryFilePos* cur = &pHandle->cur;
+  
+  STableCheckInfo* pCheckInfo = taosArrayGet(pHandle->pTableCheckInfo, pHandle->activeIndex);
+  
+  if (!pCheckInfo->checkFirstFileBlock && pFileHandle != NULL) {
+    int32_t fid = getFileIdFromKey(pCheckInfo->lastKey);
+    SFileGroup* fileGroup = tsdbSearchFGroup(pFileHandle, fid);
+    pCheckInfo->checkFirstFileBlock = true;
+    
+    if (fileGroup != NULL) {
+      return getQualifiedDataBlock(pHandle, pCheckInfo, 1);
+    } else { // no data in file, try cache
+      return hasMoreDataInCacheForSingleModel(pHandle);
+    }
+  } else {
+    pCheckInfo->checkFirstFileBlock = true;
+    if (pFileHandle == NULL) {
+      cur->fid = -1;
+    }
+    
+    if (cur->fid == -1 || pFileHandle != NULL) { // try data in cache
+      return hasMoreDataInCacheForSingleModel(pHandle);
+    } else {
+      return true;
+    }
+  }
+  
+}
+
 static bool hasMoreDataInCacheForMultiModel(STsdbQueryHandle* pHandle) {
   size_t numOfTables = taosArrayGetSize(pHandle->pTableCheckInfo);
   assert(numOfTables > 0);
@@ -372,7 +720,7 @@ static bool hasMoreDataInCacheForMultiModel(STsdbQueryHandle* pHandle) {
 bool tsdbNextDataBlock(tsdb_query_handle_t *pQueryHandle) {
   STsdbQueryHandle* pHandle = (STsdbQueryHandle*) pQueryHandle;
   if (pHandle->model == SINGLE_TABLE_MODEL) {
-    return hasMoreDataInCacheForSingleModel(pHandle);
+    return hasMoreDataInFileForSingleTableModel(pHandle);
   } else {
     return hasMoreDataInCacheForMultiModel(pHandle);
   }
@@ -704,8 +1052,6 @@ bool tSkipListNodeFilterCallback(const void* pNode, void* param) {
   
   STable* pTable = (STable*)(SL_GET_NODE_DATA((SSkipListNode*)pNode));
   
-  char   buf[TSDB_MAX_TAGS_LEN] = {0};
-  
   char* val = dataRowTuple(pTable->tagVal);  // todo not only the first column
   int8_t type = pInfo->sch.type;
   
@@ -765,9 +1111,11 @@ static int32_t doQueryTableList(STable* pSTable, SArray* pRes, const char* pCond
   // query according to the binary expression
   SSyntaxTreeFilterSupporter s = {.pTagSchema = stcol, .numOfTags = schemaNCols(pSTable->tagSchema)};
   
-  SBinaryFilterSupp supp = {.fp = (__result_filter_fn_t)tSkipListNodeFilterCallback,
+  SBinaryFilterSupp supp = {
+      .fp = (__result_filter_fn_t)tSkipListNodeFilterCallback,
       .setupInfoFn = (__do_filter_suppl_fn_t)filterPrepare,
-      .pExtInfo = &s};
+      .pExtInfo = &s
+  };
   
   tSQLBinaryExprTraverse(pExpr, pSTable->pIndex, pRes, &supp);
   tSQLBinaryExprDestroy(&pExpr, tSQLListTraverseDestroyInfo);
diff --git a/tests/examples/c/demo.c b/tests/examples/c/demo.c
index 6fcedb8123cb2ea8e6bb6b89a3b7d45c96bcd3f6..b621781a3c81e4155841ac5d4ec31aae6a38518e 100644
--- a/tests/examples/c/demo.c
+++ b/tests/examples/c/demo.c
@@ -46,7 +46,8 @@ int main(int argc, char *argv[]) {
   }
   printf("success to connect to server\n");
 
-  int32_t code = taos_query(taos, "select * from test.t1");
+//  int32_t code = taos_query(taos, "insert into test.tm2 values(now, 1)(now+1m,2)(now+2m,3) (now+3m, 4) (now+4m, 5);");
+  int32_t code = taos_query(taos, "insert into test.tm2 values(now, 99)");
   if (code != 0) {
     printf("failed to execute query, reason:%s\n", taos_errstr(taos));
   }