diff --git a/source/libs/parser/inc/parInsertUtil.h b/source/libs/parser/inc/parInsertUtil.h
index ce14f822e4..61fbf1504b 100644
--- a/source/libs/parser/inc/parInsertUtil.h
+++ b/source/libs/parser/inc/parInsertUtil.h
@@ -153,6 +153,8 @@ typedef struct STableDataCxt {
   SBoundColInfo  boundColsInfo;
   SArray        *pValues;
   SSubmitTbData *pData;
+  TSKEY          lastTs;
+  bool           ordered;
 } STableDataCxt;
 
 typedef struct SVgroupDataCxt {
@@ -161,6 +163,7 @@ typedef struct SVgroupDataCxt {
 } SVgroupDataCxt;
 
 int32_t insInitBoundColsInfo(int32_t numOfBound, SBoundColInfo *pInfo);
+void    insCheckTableDataOrder(STableDataCxt *pTableCxt, TSKEY tsKey);
 int32_t insGetTableDataCxt(SHashObj *pHash, void *id, int32_t idLen, STableMeta *pTableMeta,
                            SVCreateTbReq **pCreateTbReq, STableDataCxt **pTableCxt);
 int32_t insMergeTableDataCxt(SHashObj *pTableHash, SArray **pVgDataBlocks);
diff --git a/source/libs/parser/src/parInsertSql.c b/source/libs/parser/src/parInsertSql.c
index 03068ba83e..3e631b197f 100644
--- a/source/libs/parser/src/parInsertSql.c
+++ b/source/libs/parser/src/parInsertSql.c
@@ -1175,6 +1175,9 @@ static int parseOneRow(SInsertParseContext* pCxt, const char** pSql, STableDataC
   if (TSDB_CODE_SUCCESS == code) {
     SRow** pRow = taosArrayReserve(pTableCxt->pData->aRowP, 1);
     code = tRowBuild(pTableCxt->pValues, pTableCxt->pSchema, pRow);
+    if (TSDB_CODE_SUCCESS == code) {
+      insCheckTableDataOrder(pTableCxt, TD_ROW_KEY(*pRow));
+    }
   }
 
   if (TSDB_CODE_SUCCESS == code && !isParseBindParam) {
diff --git a/source/libs/parser/src/parInsertUtil.c b/source/libs/parser/src/parInsertUtil.c
index a138b684d1..a271165d5d 100644
--- a/source/libs/parser/src/parInsertUtil.c
+++ b/source/libs/parser/src/parInsertUtil.c
@@ -981,6 +981,20 @@ int32_t insInitBoundColsInfo(int32_t numOfBound, SBoundColInfo* pInfo) {
   return TSDB_CODE_SUCCESS;
 }
 
+void insCheckTableDataOrder(STableDataCxt* pTableCxt, TSKEY tsKey) {
+  // once the data block is disordered, we do NOT keep previous timestamp any more
+  if (!pTableCxt->ordered) {
+    return;
+  }
+
+  if (tsKey <= pTableCxt->lastTs) {
+    pTableCxt->ordered = false;
+  }
+
+  pTableCxt->lastTs = tsKey;
+  return;
+}
+
 static void destroyBoundColInfo(SBoundColInfo* pInfo) { taosMemoryFreeClear(pInfo->pColIndex); }
 
 static int32_t createTableDataCxt(STableMeta* pTableMeta, SVCreateTbReq** pCreateTbReq, STableDataCxt** pOutput) {
@@ -991,6 +1005,9 @@ static int32_t createTableDataCxt(STableMeta* pTableMeta, SVCreateTbReq** pCreat
 
   int32_t code = TSDB_CODE_SUCCESS;
 
+  pTableCxt->ordered = true;
+  pTableCxt->lastTs = 0;
+
   pTableCxt->pMeta = tableMetaDup(pTableMeta);
   if (NULL == pTableCxt->pMeta) {
     code = TSDB_CODE_OUT_OF_MEMORY;
@@ -1179,7 +1196,9 @@ int32_t insMergeTableDataCxt(SHashObj* pTableHash, SArray** pVgDataBlocks) {
   void* p = taosHashIterate(pTableHash, NULL);
   while (TSDB_CODE_SUCCESS == code && NULL != p) {
     STableDataCxt* pTableCxt = *(STableDataCxt**)p;
-    code = tRowMergeSort(pTableCxt->pData->aRowP, pTableCxt->pSchema, 0);
+    if (pTableCxt->ordered) {
+      code = tRowMergeSort(pTableCxt->pData->aRowP, pTableCxt->pSchema, 0);
+    }
     if (TSDB_CODE_SUCCESS == code) {
       SVgroupDataCxt* pVgCxt = NULL;
       int32_t         vgId = pTableCxt->pMeta->vgId;