diff --git a/source/client/inc/clientSml.h b/source/client/inc/clientSml.h
index d5f1cf512c..11f72efeaf 100644
--- a/source/client/inc/clientSml.h
+++ b/source/client/inc/clientSml.h
@@ -185,6 +185,7 @@ typedef struct {
 
   //
   SArray      *preLineTagKV;
+  SArray      *maxTagKVs;
   SArray      *preLineColKV;
 
   SSmlLineInfo preLine;
@@ -199,7 +200,7 @@ typedef struct {
 #define IS_SAME_SUPER_TABLE (elements->measureLen == info->preLine.measureLen \
 && memcmp(elements->measure, info->preLine.measure, elements->measureLen) == 0)
 
-#define IS_SAME_KEY (preKV->keyLen == kv.keyLen && memcmp(preKV->key, kv.key, kv.keyLen) == 0)
+#define IS_SAME_KEY (maxKV->keyLen == kv.keyLen && memcmp(maxKV->key, kv.key, kv.keyLen) == 0)
 
 extern int64_t smlFactorNS[3];
 extern int64_t smlFactorS[3];
diff --git a/source/client/src/clientSml.c b/source/client/src/clientSml.c
index 4d091e4b61..ca6395b52b 100644
--- a/source/client/src/clientSml.c
+++ b/source/client/src/clientSml.c
@@ -1054,6 +1054,7 @@ void smlDestroyInfo(SSmlHandle *info) {
   taosHashCleanup(info->pVgHash);
 
   taosArrayDestroy(info->preLineTagKV);
+  taosArrayDestroy(info->maxTagKVs);
   taosArrayDestroy(info->preLineColKV);
 
   if (!info->dataFormat) {
@@ -1090,6 +1091,7 @@ SSmlHandle *smlBuildSmlInfo(TAOS *taos) {
   info->dataFormat = true;
 
   info->preLineTagKV = taosArrayInit(8, sizeof(SSmlKv));
+  info->maxTagKVs = taosArrayInit(8, sizeof(SSmlKv));
   info->preLineColKV = taosArrayInit(8, sizeof(SSmlKv));
 
   if (NULL == info->pVgHash) {
diff --git a/source/client/src/clientSmlJson.c b/source/client/src/clientSmlJson.c
index c4cd558418..550d1c8edf 100644
--- a/source/client/src/clientSmlJson.c
+++ b/source/client/src/clientSmlJson.c
@@ -429,9 +429,8 @@ static inline int32_t smlParseMetricFromJSON(SSmlHandle *info, cJSON *metric, SS
 
 const char *jsonName[OTD_JSON_FIELDS_NUM] = {"metric", "timestamp", "value", "tags"};
 static int32_t smlGetJsonElements(cJSON *root, cJSON ***marks){
-  cJSON *child = root->child;
-
   for (int i = 0; i < OTD_JSON_FIELDS_NUM; ++i) {
+    cJSON *child = root->child;
     while(child != NULL)
     {
       if(strcasecmp(child->string, jsonName[i]) == 0){
@@ -441,7 +440,7 @@ static int32_t smlGetJsonElements(cJSON *root, cJSON ***marks){
       child = child->next;
     }
     if(*marks[i] == NULL){
-      uError("smlGetJsonElements error, not find mark:%s", jsonName[i]);
+      uError("smlGetJsonElements error, not find mark:%d:%s", i, jsonName[i]);
       return -1;
     }
   }
@@ -648,6 +647,7 @@ static int32_t smlParseTagsFromJSON(SSmlHandle *info, cJSON *tags, SSmlLineInfo
 
   int     cnt = 0;
   SArray *preLineKV = info->preLineTagKV;
+  SArray *maxKVs = info->maxTagKVs;
   bool    isSuperKVInit = true;
   SArray *superKV = NULL;
   if(info->dataFormat){
@@ -671,11 +671,12 @@ static int32_t smlParseTagsFromJSON(SSmlHandle *info, cJSON *tags, SSmlLineInfo
       if(unlikely(taosArrayGetSize(superKV) == 0)){
         isSuperKVInit = false;
       }
-      taosArraySetSize(preLineKV, 0);
+      taosArraySetSize(maxKVs, 0);
     }
   }else{
-    taosArraySetSize(preLineKV, 0);
+    taosArraySetSize(maxKVs, 0);
   }
+  taosArraySetSize(preLineKV, 0);
 
   int32_t tagNum = cJSON_GetArraySize(tags);
   if(unlikely(tagNum == 0)){
@@ -710,14 +711,14 @@ static int32_t smlParseTagsFromJSON(SSmlHandle *info, cJSON *tags, SSmlLineInfo
       }
 
       if(isSameMeasure){
-        if(unlikely(cnt >= taosArrayGetSize(preLineKV))) {
+        if(unlikely(cnt >= taosArrayGetSize(maxKVs))) {
           info->dataFormat = false;
           info->reRun      = true;
           return TSDB_CODE_SUCCESS;
         }
-        SSmlKv *preKV = (SSmlKv *)taosArrayGet(preLineKV, cnt);
-        if(unlikely(kv.length > preKV->length)){
-          preKV->length = kv.length;
+        SSmlKv *maxKV = (SSmlKv *)taosArrayGet(maxKVs, cnt);
+        if(unlikely(kv.length > maxKV->length)){
+          maxKV->length = kv.length;
           SSmlSTableMeta *tableMeta = (SSmlSTableMeta *)nodeListGet(info->superTables, elements->measure, elements->measureLen, NULL);
           ASSERT(tableMeta != NULL);
 
@@ -737,11 +738,11 @@ static int32_t smlParseTagsFromJSON(SSmlHandle *info, cJSON *tags, SSmlLineInfo
             info->reRun      = true;
             return TSDB_CODE_SUCCESS;
           }
-          SSmlKv *preKV = (SSmlKv *)taosArrayGet(superKV, cnt);
-          if(unlikely(kv.length > preKV->length)) {
-            preKV->length = kv.length;
+          SSmlKv *maxKV = (SSmlKv *)taosArrayGet(superKV, cnt);
+          if(unlikely(kv.length > maxKV->length)) {
+            maxKV->length = kv.length;
           }else{
-            kv.length = preKV->length;
+            kv.length = maxKV->length;
           }
           info->needModifySchema = true;
 
@@ -753,11 +754,12 @@ static int32_t smlParseTagsFromJSON(SSmlHandle *info, cJSON *tags, SSmlLineInfo
         }else{
           taosArrayPush(superKV, &kv);
         }
-        taosArrayPush(preLineKV, &kv);
+        taosArrayPush(maxKVs, &kv);
       }
     }else{
-      taosArrayPush(preLineKV, &kv);
+      taosArrayPush(maxKVs, &kv);
     }
+    taosArrayPush(preLineKV, &kv);
     cnt++;
   }
 
@@ -921,6 +923,9 @@ static int32_t smlParseJSONStringExt(SSmlHandle *info, cJSON *root, SSmlLineInfo
   cJSON *tsJson = NULL;
   cJSON *valueJson = NULL;
   cJSON *tagsJson = NULL;
+  char* rootStr = cJSON_PrintUnformatted(root);
+  uError("rootStr:%s", rootStr);
+  taosMemoryFree(rootStr);
 
   int32_t size = cJSON_GetArraySize(root);
   // outmost json fields has to be exactly 4
diff --git a/source/client/src/clientSmlLine.c b/source/client/src/clientSmlLine.c
index f56ad34fc5..d93fdf198f 100644
--- a/source/client/src/clientSmlLine.c
+++ b/source/client/src/clientSmlLine.c
@@ -57,52 +57,6 @@ uint8_t smlPrecisionConvert[7] = {TSDB_TIME_PRECISION_NANO, TSDB_TIME_PRECISION_
                                   TSDB_TIME_PRECISION_SECONDS, TSDB_TIME_PRECISION_MILLI, TSDB_TIME_PRECISION_MICRO,
                                   TSDB_TIME_PRECISION_NANO};
 
-static bool smlParseBool(SSmlKv *kvVal) {
-  const char *pVal = kvVal->value;
-  int32_t     len = kvVal->length;
-  if ((len == 1) && (pVal[0] == 't' || pVal[0] == 'T')) {
-    kvVal->i = TSDB_TRUE;
-    return true;
-  }
-
-  if ((len == 1) && (pVal[0] == 'f' || pVal[0] == 'F')) {
-    kvVal->i = TSDB_FALSE;
-    return true;
-  }
-
-  if ((len == 4) && !strncasecmp(pVal, "true", len)) {
-    kvVal->i = TSDB_TRUE;
-    return true;
-  }
-  if ((len == 5) && !strncasecmp(pVal, "false", len)) {
-    kvVal->i = TSDB_FALSE;
-    return true;
-  }
-  return false;
-}
-
-static bool smlIsBinary(const char *pVal, uint16_t len) {
-  // binary: "abc"
-  if (len < 2) {
-    return false;
-  }
-  if (pVal[0] == '"' && pVal[len - 1] == '"') {
-    return true;
-  }
-  return false;
-}
-
-static bool smlIsNchar(const char *pVal, uint16_t len) {
-  // nchar: L"abc"
-  if (len < 3) {
-    return false;
-  }
-  if (pVal[1] == '"' && pVal[len - 1] == '"' && (pVal[0] == 'l' || pVal[0] == 'L')) {
-    return true;
-  }
-  return false;
-}
-
 static int64_t smlParseInfluxTime(SSmlHandle *info, const char *data, int32_t len) {
   uint8_t toPrecision = info->currSTableMeta ? info->currSTableMeta->tableInfo.precision : TSDB_TIME_PRECISION_NANO;
 
@@ -189,6 +143,7 @@ static int32_t smlParseTagKv(SSmlHandle *info, char **sql, char *sqlEnd,
 
   int     cnt = 0;
   SArray *preLineKV = info->preLineTagKV;
+  SArray *maxKVs = info->maxTagKVs;
   bool    isSuperKVInit = true;
   SArray *superKV = NULL;
   if(info->dataFormat){
@@ -212,12 +167,12 @@ static int32_t smlParseTagKv(SSmlHandle *info, char **sql, char *sqlEnd,
       if(unlikely(taosArrayGetSize(superKV) == 0)){
         isSuperKVInit = false;
       }
-      taosArraySetSize(preLineKV, 0);
+      taosArraySetSize(maxKVs, 0);
     }
   }else{
-    taosArraySetSize(preLineKV, 0);
+    taosArraySetSize(maxKVs, 0);
   }
-
+  taosArraySetSize(preLineKV, 0);
 
   while (*sql < sqlEnd) {
     if (unlikely(IS_SPACE(*sql))) {
@@ -295,14 +250,14 @@ static int32_t smlParseTagKv(SSmlHandle *info, char **sql, char *sqlEnd,
       }
 
       if(isSameMeasure){
-        if(unlikely(cnt >= taosArrayGetSize(preLineKV))) {
+        if(unlikely(cnt >= taosArrayGetSize(maxKVs))) {
           info->dataFormat = false;
           info->reRun      = true;
           return TSDB_CODE_SUCCESS;
         }
-        SSmlKv *preKV = (SSmlKv *)taosArrayGet(preLineKV, cnt);
-        if(unlikely(kv.length > preKV->length)){
-          preKV->length = kv.length;
+        SSmlKv *maxKV = (SSmlKv *)taosArrayGet(maxKVs, cnt);
+        if(unlikely(kv.length > maxKV->length)){
+          maxKV->length = kv.length;
           SSmlSTableMeta *tableMeta = (SSmlSTableMeta *)nodeListGet(info->superTables, currElement->measure, currElement->measureLen, NULL);
           ASSERT(tableMeta != NULL);
 
@@ -322,11 +277,11 @@ static int32_t smlParseTagKv(SSmlHandle *info, char **sql, char *sqlEnd,
             info->reRun      = true;
             return TSDB_CODE_SUCCESS;
           }
-          SSmlKv *preKV = (SSmlKv *)taosArrayGet(superKV, cnt);
-          if(unlikely(kv.length > preKV->length)) {
-            preKV->length = kv.length;
+          SSmlKv *maxKV = (SSmlKv *)taosArrayGet(superKV, cnt);
+          if(unlikely(kv.length > maxKV->length)) {
+            maxKV->length = kv.length;
           }else{
-            kv.length = preKV->length;
+            kv.length = maxKV->length;
           }
           info->needModifySchema = true;
 
@@ -338,11 +293,12 @@ static int32_t smlParseTagKv(SSmlHandle *info, char **sql, char *sqlEnd,
         }else{
           taosArrayPush(superKV, &kv);
         }
-        taosArrayPush(preLineKV, &kv);
+        taosArrayPush(maxKVs, &kv);
       }
     }else{
-      taosArrayPush(preLineKV, &kv);
+      taosArrayPush(maxKVs, &kv);
     }
+    taosArrayPush(preLineKV, &kv);
 
     cnt++;
     if(IS_SPACE(*sql)){
@@ -518,15 +474,15 @@ static int32_t smlParseColKv(SSmlHandle *info, char **sql, char *sqlEnd,
           info->reRun      = true;
           return TSDB_CODE_SUCCESS;
         }
-        SSmlKv *preKV = (SSmlKv *)taosArrayGet(preLineKV, cnt);
-        if(kv.type != preKV->type){
+        SSmlKv *maxKV = (SSmlKv *)taosArrayGet(preLineKV, cnt);
+        if(kv.type != maxKV->type){
           info->dataFormat = false;
           info->reRun      = true;
           return TSDB_CODE_SUCCESS;
         }
 
-        if(unlikely(IS_VAR_DATA_TYPE(kv.type) && kv.length > preKV->length)){
-          preKV->length = kv.length;
+        if(unlikely(IS_VAR_DATA_TYPE(kv.type) && kv.length > maxKV->length)){
+          maxKV->length = kv.length;
           SSmlSTableMeta *tableMeta = (SSmlSTableMeta *)nodeListGet(info->superTables, currElement->measure, currElement->measureLen, NULL);
           ASSERT(tableMeta != NULL);
 
@@ -546,18 +502,18 @@ static int32_t smlParseColKv(SSmlHandle *info, char **sql, char *sqlEnd,
             info->reRun      = true;
             return TSDB_CODE_SUCCESS;
           }
-          SSmlKv *preKV = (SSmlKv *)taosArrayGet(superKV, cnt);
-          if(unlikely(kv.type != preKV->type)){
+          SSmlKv *maxKV = (SSmlKv *)taosArrayGet(superKV, cnt);
+          if(unlikely(kv.type != maxKV->type)){
             info->dataFormat = false;
             info->reRun      = true;
             return TSDB_CODE_SUCCESS;
           }
 
           if(IS_VAR_DATA_TYPE(kv.type)){
-            if(kv.length > preKV->length) {
-              preKV->length = kv.length;
+            if(kv.length > maxKV->length) {
+              maxKV->length = kv.length;
             }else{
-              kv.length = preKV->length;
+              kv.length = maxKV->length;
             }
             info->needModifySchema = true;
           }
diff --git a/source/client/src/clientSmlTelnet.c b/source/client/src/clientSmlTelnet.c
index 53a7e3e81e..a1ddfddfd0 100644
--- a/source/client/src/clientSmlTelnet.c
+++ b/source/client/src/clientSmlTelnet.c
@@ -73,6 +73,7 @@ static int32_t smlParseTelnetTags(SSmlHandle *info, char *data, char *sqlEnd, SS
 
   int     cnt = 0;
   SArray *preLineKV = info->preLineTagKV;
+  SArray *maxKVs = info->maxTagKVs;
   bool    isSuperKVInit = true;
   SArray *superKV = NULL;
   if(info->dataFormat){
@@ -96,12 +97,13 @@ static int32_t smlParseTelnetTags(SSmlHandle *info, char *data, char *sqlEnd, SS
       if(unlikely(taosArrayGetSize(superKV) == 0)){
         isSuperKVInit = false;
       }
-      taosArraySetSize(preLineKV, 0);
+      taosArraySetSize(maxKVs, 0);
     }
   }else{
-    taosArraySetSize(preLineKV, 0);
+    taosArraySetSize(maxKVs, 0);
   }
 
+  taosArraySetSize(preLineKV, 0);
   const char *sql = data;
   while (sql < sqlEnd) {
     JUMP_SPACE(sql, sqlEnd)
@@ -168,14 +170,14 @@ static int32_t smlParseTelnetTags(SSmlHandle *info, char *data, char *sqlEnd, SS
       }
 
       if(isSameMeasure){
-        if(unlikely(cnt >= taosArrayGetSize(preLineKV))) {
+        if(unlikely(cnt >= taosArrayGetSize(maxKVs))) {
           info->dataFormat = false;
           info->reRun      = true;
           return TSDB_CODE_SUCCESS;
         }
-        SSmlKv *preKV = (SSmlKv *)taosArrayGet(preLineKV, cnt);
-        if(unlikely(kv.length > preKV->length)){
-          preKV->length = kv.length;
+        SSmlKv *maxKV = (SSmlKv *)taosArrayGet(maxKVs, cnt);
+        if(unlikely(kv.length > maxKV->length)){
+          maxKV->length = kv.length;
           SSmlSTableMeta *tableMeta = (SSmlSTableMeta *)nodeListGet(info->superTables, elements->measure, elements->measureLen, NULL);
           ASSERT(tableMeta != NULL);
 
@@ -195,11 +197,11 @@ static int32_t smlParseTelnetTags(SSmlHandle *info, char *data, char *sqlEnd, SS
             info->reRun      = true;
             return TSDB_CODE_SUCCESS;
           }
-          SSmlKv *preKV = (SSmlKv *)taosArrayGet(superKV, cnt);
-          if(unlikely(kv.length > preKV->length)) {
-            preKV->length = kv.length;
+          SSmlKv *maxKV = (SSmlKv *)taosArrayGet(superKV, cnt);
+          if(unlikely(kv.length > maxKV->length)) {
+            maxKV->length = kv.length;
           }else{
-            kv.length = preKV->length;
+            kv.length = maxKV->length;
           }
           info->needModifySchema = true;
 
@@ -211,11 +213,12 @@ static int32_t smlParseTelnetTags(SSmlHandle *info, char *data, char *sqlEnd, SS
         }else{
           taosArrayPush(superKV, &kv);
         }
-        taosArrayPush(preLineKV, &kv);
+        taosArrayPush(maxKVs, &kv);
       }
     }else{
-      taosArrayPush(preLineKV, &kv);
+      taosArrayPush(maxKVs, &kv);
     }
+    taosArrayPush(preLineKV, &kv);
     cnt++;
   }
   SSmlTableInfo *tinfo = (SSmlTableInfo *)nodeListGet(info->childTables, elements, POINTER_BYTES, is_same_child_table_telnet);