diff --git a/src/client/src/tscParseLineProtocol.c b/src/client/src/tscParseLineProtocol.c
index 611038d98e46e7cc36f7b3889901ee57f28de20a..f7eafb094ee6b9900f29baa74b22b34fbb8030ea 100644
--- a/src/client/src/tscParseLineProtocol.c
+++ b/src/client/src/tscParseLineProtocol.c
@@ -794,7 +794,7 @@ static int32_t arrangePointsByChildTableName(TAOS_SML_DATA_POINT* points, int nu
 }
 
 static int32_t addChildTableDataPointsToInsertSql(char* cTableName, char* sTableName, SSmlSTableSchema* sTableSchema, SArray* cTablePoints,
-                                                  char* sql, int32_t capacity, int32_t* cTableSqlLen, SSmlLinesInfo* info) {
+                                                  char* sql, int32_t capacity, int32_t* cTableSqlLen, int fromIndex, int* nextIndex, SSmlLinesInfo* info) {
   size_t  numTags = taosArrayGetSize(sTableSchema->tags);
   size_t  numCols = taosArrayGetSize(sTableSchema->fields);
   size_t  rows = taosArrayGetSize(cTablePoints);
@@ -845,7 +845,11 @@ static int32_t addChildTableDataPointsToInsertSql(char* cTableName, char* sTable
   totalLen += snprintf(sql + totalLen, freeBytes - totalLen, ") values ");
 
   TAOS_SML_KV** colKVs = malloc(numCols * sizeof(TAOS_SML_KV*));
-  for (int r = 0; r < rows; ++r) {
+  int r = fromIndex;
+  for (; r < rows; ++r) {
+    if (freeBytes - totalLen < 1024 * 16) {
+      break;
+    }
     totalLen += snprintf(sql + totalLen, freeBytes - totalLen, "(");
 
     memset(colKVs, 0, numCols * sizeof(TAOS_SML_KV*));
@@ -873,6 +877,10 @@ static int32_t addChildTableDataPointsToInsertSql(char* cTableName, char* sTable
   }
   free(colKVs);
 
+  if (r == fromIndex) {
+    tscError("buf can not fit one line");
+  }
+  *nextIndex = r;
   *cTableSqlLen = totalLen;
 
   return 0;
@@ -981,11 +989,12 @@ static int32_t applyDataPointsWithSqlInsert(TAOS* taos, TAOS_SML_DATA_POINT* poi
   info->numBatches = 0;
   SSmlSqlInsertBatch *batch = info->batches;
   batch->sql = malloc(tsMaxSQLStringLen + 1);
-  //TODO batch->sql allocation errror
   int32_t freeBytes = tsMaxSQLStringLen;
   int32_t usedBytes = sprintf(batch->sql, "insert into");
   freeBytes -= usedBytes;
 
+  int32_t cTableSqlLen = 0;
+
   SArray** pCTablePoints = taosHashIterate(cname2points, NULL);
   while (pCTablePoints) {
     SArray* cTablePoints = *pCTablePoints;
@@ -993,37 +1002,49 @@ static int32_t applyDataPointsWithSqlInsert(TAOS* taos, TAOS_SML_DATA_POINT* poi
     TAOS_SML_DATA_POINT* point = taosArrayGetP(cTablePoints, 0);
     SSmlSTableSchema*    sTableSchema = taosArrayGet(stableSchemas, point->schemaIdx);
 
-    tscDebug("SML:0x%"PRIx64" add child table points to SQL. child table: %s of super table %s",
-             info->id, point->childTableName, point->stableName);
-    int32_t cTableSqlLen = 0;
-    code = addChildTableDataPointsToInsertSql(point->childTableName, point->stableName, sTableSchema, cTablePoints, batch->sql+usedBytes, freeBytes, &cTableSqlLen, info);
-    int32_t safeBound = 1024 * 24;
-    if (cTableSqlLen < freeBytes - safeBound) {
+    int32_t nextIndex = 0;
+    int32_t fromIndex = nextIndex;
+
+    while (nextIndex != taosArrayGetSize(cTablePoints)) {
+      fromIndex = nextIndex;
+      code = addChildTableDataPointsToInsertSql(point->childTableName, point->stableName, sTableSchema, cTablePoints,
+                                                batch->sql + usedBytes, freeBytes, &cTableSqlLen, fromIndex, &nextIndex,
+                                                info);
+      tscDebug("SML:0x%"PRIx64" add child table points to SQL. child table: %s of super table %s. range[%d-%d).",
+               info->id, point->childTableName, point->stableName, fromIndex, nextIndex);
       usedBytes += cTableSqlLen;
       freeBytes -= cTableSqlLen;
-    } else {
-      batch->sql[usedBytes] = '\0';
-      info->numBatches++;
-      if (info->numBatches >= MAX_SML_SQL_INSERT_BATCHES) {
-        tscError("SML:0x%"PRIx64" Apply points failed. exceeds max sql insert batches", info->id);
-        code = TSDB_CODE_TSC_OUT_OF_MEMORY;
-        goto cleanup;
-      }
+      if (nextIndex != taosArrayGetSize(cTablePoints)) {
+        batch->sql[usedBytes] = '\0';
+        info->numBatches++;
+        tscDebug("SML:0x%"PRIx64" sql: %s" , info->id, batch->sql);
+
+        if (info->numBatches >= MAX_SML_SQL_INSERT_BATCHES) {
+          tscError("SML:0x%"PRIx64" Apply points failed. exceeds max sql insert batches", info->id);
+          code = TSDB_CODE_TSC_OUT_OF_MEMORY;
+          goto cleanup;
+        }
 
-      batch = &info->batches[info->numBatches];
-      batch->sql = malloc(tsMaxSQLStringLen + 1);
-      freeBytes = tsMaxSQLStringLen;
-      usedBytes = sprintf(batch->sql, "insert into");
-      freeBytes -= usedBytes;
-      //TODO deal with one child table rows exceeds columns
-      code = addChildTableDataPointsToInsertSql(point->childTableName, point->stableName, sTableSchema, cTablePoints, batch->sql+usedBytes, freeBytes, &cTableSqlLen, info);
+        batch = &info->batches[info->numBatches];
+        batch->sql = malloc(tsMaxSQLStringLen + 1);
+        freeBytes = tsMaxSQLStringLen;
+        usedBytes = sprintf(batch->sql, "insert into");
+        freeBytes -= usedBytes;
+      }
     }
 
     pCTablePoints = taosHashIterate(cname2points, pCTablePoints);
   }
+  usedBytes += cTableSqlLen;
+  freeBytes -= cTableSqlLen;
   batch->sql[usedBytes] = '\0';
   info->numBatches++;
-
+  tscDebug("SML:0x%"PRIx64" sql: %s" , info->id, batch->sql);
+  if (info->numBatches >= MAX_SML_SQL_INSERT_BATCHES) {
+    tscError("SML:0x%"PRIx64" Apply points failed. exceeds max sql insert batches", info->id);
+    code = TSDB_CODE_TSC_OUT_OF_MEMORY;
+    goto cleanup;
+  }
   bool batchesExecuted[MAX_SML_SQL_INSERT_BATCHES] = {false};
 
   for (int i = 0; i < info->numBatches; ++i) {