diff --git a/src/client/src/tscStream.c b/src/client/src/tscStream.c
index 99669ecd895f10474d70f44cfaa35c73002be433..a1b4ba0bf4994b89758380debef91c3114c361a6 100644
--- a/src/client/src/tscStream.c
+++ b/src/client/src/tscStream.c
@@ -246,11 +246,7 @@ static void tscProcessStreamRetrieveResult(void *param, TAOS_RES *res, int numOf
     }
 
     if (!pStream->isProject) {
-      if (pStream->intervalTimeUnit == 'y' || pStream->intervalTimeUnit == 'n') {
-        pStream->stime = taosAddNatualInterval(pStream->stime, pStream->slidingTime, pStream->slidingTimeUnit, pStream->precision);
-      } else {
-        pStream->stime += pStream->slidingTime;
-      }
+      pStream->stime = taosTimeAdd(pStream->stime, pStream->slidingTime, pStream->slidingTimeUnit, pStream->precision);
     }
     // actually only one row is returned. this following is not necessary
     taos_fetch_rows_a(res, tscProcessStreamRetrieveResult, pStream);
diff --git a/src/common/inc/tname.h b/src/common/inc/tname.h
index beef9ff375b5339fb3335c60653ac465e40ce3f3..b21d93fe8d24b18a39cc098007051603967c36ea 100644
--- a/src/common/inc/tname.h
+++ b/src/common/inc/tname.h
@@ -35,7 +35,6 @@ bool tscValidateTableNameLength(size_t len);
 
 SColumnFilterInfo* tscFilterInfoClone(const SColumnFilterInfo* src, int32_t numOfFilters);
 
-int64_t taosAddNatualInterval(int64_t key, int64_t intervalTime, char timeUnit, int16_t precision);
 int32_t taosCountNatualInterval(int64_t skey, int64_t ekey, int64_t intervalTime, char timeUnit, int16_t precision);
 int64_t taosGetIntervalStartTimestamp(int64_t startTime, int64_t slidingTime, int64_t intervalTime, char timeUnit, int16_t precision);
 
diff --git a/src/common/src/tname.c b/src/common/src/tname.c
index bb18cb6847df3eb748e0a0a38ca4b6d866ce53d9..4193b770d25c2aa6b287e4cd1b06e5831a683c83 100644
--- a/src/common/src/tname.c
+++ b/src/common/src/tname.c
@@ -99,33 +99,6 @@ SColumnFilterInfo* tscFilterInfoClone(const SColumnFilterInfo* src, int32_t numO
   return pFilter;
 }
 
-int64_t taosAddNatualInterval(int64_t key, int64_t intervalTime, char timeUnit, int16_t precision) {
-  key /= 1000;
-  if (precision == TSDB_TIME_PRECISION_MICRO) {
-    key /= 1000;
-  }
-
-  struct tm tm;
-  time_t t = (time_t)key;
-  localtime_r(&t, &tm);
-
-  if (timeUnit == 'y') {
-    intervalTime *= 12;
-  }
-
-  int mon = (int)(tm.tm_year * 12 + tm.tm_mon + intervalTime);
-  tm.tm_year = mon / 12;
-  tm.tm_mon = mon % 12;
-
-  key = mktime(&tm) * 1000L;
-
-  if (precision == TSDB_TIME_PRECISION_MICRO) {
-    key *= 1000L;
-  }
-
-  return key;
-}
-
 int32_t taosCountNatualInterval(int64_t skey, int64_t ekey, int64_t intervalTime, char timeUnit, int16_t precision) {
   skey /= 1000;
   ekey /= 1000;
diff --git a/src/os/src/detail/osTime.c b/src/os/src/detail/osTime.c
index c9c61304981050cafffb156b7672fc8fb0bc6ab4..21b972c7c8ada1a7aaf525f0561072f88e02decd 100644
--- a/src/os/src/detail/osTime.c
+++ b/src/os/src/detail/osTime.c
@@ -496,7 +496,7 @@ int64_t taosTimeTruncate(int64_t t, const SInterval* pInterval, int32_t precisio
     }
   }
 
-  return taosTimeAdd(start, pInterval->offset, pInterval->intervalUnit, precision);
+  return taosTimeAdd(start, pInterval->offset, pInterval->offsetUnit, precision);
 }
 
 // internal function, when program is paused in debugger,
diff --git a/src/query/src/qFill.c b/src/query/src/qFill.c
index 6ae36a160d95aad3912d38684c4c3415579b4c18..d0ecd22739e6363fa66ac4b925f8734aa296c46c 100644
--- a/src/query/src/qFill.c
+++ b/src/query/src/qFill.c
@@ -108,21 +108,15 @@ void* taosDestoryFillInfo(SFillInfo* pFillInfo) {
   return NULL;
 }
 
-static TSKEY taosGetRevisedEndKey(TSKEY ekey, int32_t order, int64_t timeInterval, int8_t slidingTimeUnit, int8_t precision) {
-  if (order == TSDB_ORDER_ASC) {
-    return ekey;
-  } else {
-    return taosGetIntervalStartTimestamp(ekey, timeInterval, timeInterval, slidingTimeUnit, precision);
-  }
-}
-
 void taosFillSetStartInfo(SFillInfo* pFillInfo, int32_t numOfRows, TSKEY endKey) {
   if (pFillInfo->fillType == TSDB_FILL_NONE) {
     return;
   }
 
-  pFillInfo->endKey = taosGetRevisedEndKey(endKey, pFillInfo->order, pFillInfo->interval.sliding, pFillInfo->interval.slidingUnit,
-      pFillInfo->precision);
+  pFillInfo->endKey = endKey;
+  if (pFillInfo->order != TSDB_ORDER_ASC) {
+    pFillInfo->endKey = taosTimeTruncate(endKey, &pFillInfo->interval, pFillInfo->precision);
+  }
 
   pFillInfo->rowIdx    = 0;
   pFillInfo->numOfRows = numOfRows;
@@ -172,8 +166,10 @@ int64_t getFilledNumOfRes(SFillInfo* pFillInfo, TSKEY ekey, int32_t maxNumOfRows
 
   int32_t numOfRows = taosNumOfRemainRows(pFillInfo);
 
-  TSKEY ekey1 = taosGetRevisedEndKey(ekey, pFillInfo->order, pFillInfo->interval.sliding, pFillInfo->interval.slidingUnit,
-      pFillInfo->precision);
+  TSKEY ekey1 = ekey;
+  if (pFillInfo->order != TSDB_ORDER_ASC) {
+    pFillInfo->endKey = taosTimeTruncate(ekey, &pFillInfo->interval, pFillInfo->precision);
+  }
 
   int64_t numOfRes = -1;
   if (numOfRows > 0) {  // still fill gap within current data block, not generating data after the result set.
@@ -374,12 +370,7 @@ static void doFillResultImpl(SFillInfo* pFillInfo, tFilePage** data, int32_t* nu
     setTagsValue(pFillInfo, data, *num);
   }
 
-// TODO natual sliding time
-  if (pFillInfo->interval.slidingUnit != 'n' && pFillInfo->interval.slidingUnit != 'y') {
-    pFillInfo->start += (pFillInfo->interval.sliding * step);
-  } else {
-    pFillInfo->start = taosAddNatualInterval(pFillInfo->start, pFillInfo->interval.sliding*step, pFillInfo->interval.slidingUnit, pFillInfo->precision);
-  }
+  pFillInfo->start = taosTimeAdd(pFillInfo->start, pFillInfo->interval.sliding * step, pFillInfo->interval.slidingUnit, pFillInfo->precision);
   pFillInfo->numOfCurrent++;
 
   (*num) += 1;
@@ -486,12 +477,7 @@ int32_t generateDataBlockImpl(SFillInfo* pFillInfo, tFilePage** data, int32_t nu
         // set the tag value for final result
         setTagsValue(pFillInfo, data, num);
 
-        // TODO natual sliding time
-        if (pFillInfo->interval.slidingUnit != 'n' && pFillInfo->interval.slidingUnit != 'y') {
-          pFillInfo->start += (pFillInfo->interval.sliding * step);
-        } else {
-          pFillInfo->start = taosAddNatualInterval(pFillInfo->start, pFillInfo->interval.sliding*step, pFillInfo->interval.slidingUnit, pFillInfo->precision);
-        }
+        pFillInfo->start = taosTimeAdd(pFillInfo->start, pFillInfo->interval.sliding*step, pFillInfo->interval.slidingUnit, pFillInfo->precision);
         pFillInfo->rowIdx += 1;
 
         pFillInfo->numOfCurrent +=1;