diff --git a/src/client/src/tscServer.c b/src/client/src/tscServer.c
index 2e1b480fb15eb72a7b6d228a7d72737b65f61156..62f754806f719fd07f2cbbe462b116da866c9b07 100644
--- a/src/client/src/tscServer.c
+++ b/src/client/src/tscServer.c
@@ -2643,12 +2643,37 @@ int tscProcessShowCreateRsp(SSqlObj *pSql) {
   return tscLocalResultCommonBuilder(pSql, 1);
 }
 
+static void updateFieldForJson(SSqlObj *pSql, SQueryTableRsp *pQueryAttr){
+  if(pQueryAttr->tJsonSchLen <= 0) {
+    return;
+  }
+
+  SQueryInfo *pQueryInfo = tscGetQueryInfo(&pSql->cmd);
+  SFieldInfo *pFieldInfo = &pQueryInfo->fieldsInfo;
+  for(int32_t i = 0; i < pFieldInfo->numOfOutput; ++i) {
+    SInternalField *pField = tscFieldInfoGetInternalField(pFieldInfo, i);
+
+    if (pField->field.type == TSDB_DATA_TYPE_JSON) {
+      for (int k = 0; k < pQueryAttr->tJsonSchLen; ++k) {
+        if (strncmp(pField->field.name, pQueryAttr->tagJsonSchema[k].name, TSDB_MAX_JSON_KEY_LEN) == 0) {
+          pField->field.type = pQueryAttr->tagJsonSchema[k].type;
+          pField->field.bytes = TYPE_BYTES[pField->field.type];
+          tscDebug("0x%" PRIx64 " change json type %s:%s to %d", pSql->self, pField->field.name, pQueryAttr->tagJsonSchema[k].name,
+                   pField->field.type);
+          break;
+        }
+      }
+    }
+  }
+}
+
 int tscProcessQueryRsp(SSqlObj *pSql) {
   SSqlRes *pRes = &pSql->res;
 
   SQueryTableRsp *pQueryAttr = (SQueryTableRsp *)pRes->pRsp;
   pQueryAttr->qId = htobe64(pQueryAttr->qId);
-
+  pQueryAttr->tJsonSchLen = htons(pQueryAttr->tJsonSchLen);
+  updateFieldForJson(pSql, pQueryAttr);
   pRes->qId  = pQueryAttr->qId;
   pRes->data = NULL;
 
diff --git a/src/inc/query.h b/src/inc/query.h
index 0872e3dbaa517ded77dd758b30e69f273c13a580..67042764fefb74008be7cbcc387e8d89d542263b 100644
--- a/src/inc/query.h
+++ b/src/inc/query.h
@@ -28,7 +28,7 @@ typedef void* qinfo_t;
  * @param qinfo
  * @return
  */
-int32_t qCreateQueryInfo(void* tsdb, int32_t vgId, SQueryTableMsg* pQueryTableMsg, qinfo_t* qinfo, uint64_t qId);
+int32_t qCreateQueryInfo(void* tsdb, int32_t vgId, SQueryTableMsg* pQueryTableMsg, qinfo_t* qinfo, uint64_t qId, void** tJsonSchema);
 
 
 /**
diff --git a/src/inc/taosmsg.h b/src/inc/taosmsg.h
index c6d587fe1a296bc40ab804cdef160b70da273fd8..fa57982c3b95e7a80bf5a790720d6e4ea3f93f01 100644
--- a/src/inc/taosmsg.h
+++ b/src/inc/taosmsg.h
@@ -258,6 +258,11 @@ typedef struct SSchema {
   int16_t bytes;
 } SSchema;
 
+typedef struct TagJsonSSchema {
+  uint8_t type;
+  char    name[TSDB_MAX_JSON_KEY_LEN + 1];
+} TagJsonSSchema;
+
 typedef struct {
   int32_t  contLen;
   int32_t  vgId;
@@ -514,6 +519,8 @@ typedef struct {
 typedef struct {
   int32_t  code;
   union{uint64_t qhandle; uint64_t qId;}; // query handle
+  uint16_t tJsonSchLen;
+  TagJsonSSchema tagJsonSchema[];
 } SQueryTableRsp;
 
 // todo: the show handle should be replaced with id
diff --git a/src/inc/tsdb.h b/src/inc/tsdb.h
index a90780b202c6a88ab4f6ced3b5896f48ffc2538b..a4d73a84e1d33cff6cf83b29e80323418a0f31b8 100644
--- a/src/inc/tsdb.h
+++ b/src/inc/tsdb.h
@@ -419,6 +419,8 @@ int tsdbCompact(STsdbRepo *pRepo);
 bool tsdbNoProblem(STsdbRepo* pRepo);
 // unit of walSize: MB
 int tsdbCheckWal(STsdbRepo *pRepo, uint32_t walSize);
+// for tag json
+uint8_t getTagJsonType(STsdbRepo* tsdb, uint64_t uid, char* key, int32_t len);
 
 #ifdef __cplusplus
 }
diff --git a/src/query/src/queryMain.c b/src/query/src/queryMain.c
index fce7f649892f87d075c8dd64e4d1160e5d05bf77..1ead8f60315af3e88199ddf4a49ca66824c4ac0b 100644
--- a/src/query/src/queryMain.c
+++ b/src/query/src/queryMain.c
@@ -67,7 +67,39 @@ void freeParam(SQueryParam *param) {
   tfree(param->prevResult);
 }
 
-int32_t qCreateQueryInfo(void* tsdb, int32_t vgId, SQueryTableMsg* pQueryMsg, qinfo_t* pQInfo, uint64_t qId) {
+static void* setJsonTagSchema(void* tsdb, int16_t numOfOutput, SExprInfo *pExprs, SArray* pTableIdList){
+  uint16_t cnt = 0;
+  for (int i = 0; i < numOfOutput; ++i) {
+    SSqlExpr* sqlExpr = &pExprs[i].base;
+    if (sqlExpr->colType == TSDB_DATA_TYPE_JSON && sqlExpr->numOfParams > 0) {
+      cnt ++;
+    }
+  }
+  if(cnt <= 0) return NULL;
+  void* tJsonSchData = calloc(1, SHORT_BYTES + cnt*sizeof(TagJsonSSchema));
+  *(uint16_t*)(tJsonSchData) = cnt;
+  void* tmp = tJsonSchData + SHORT_BYTES;
+  for (int i = 0; i < numOfOutput; ++i) {
+    SSqlExpr* sqlExpr = &pExprs[i].base;
+    if (sqlExpr->colType == TSDB_DATA_TYPE_JSON && sqlExpr->numOfParams > 0){
+      TagJsonSSchema* schema = (TagJsonSSchema*)(tmp);
+      schema->type = TSDB_DATA_TYPE_NULL;
+      tstrncpy(schema->name, sqlExpr->param[0].pz, TSDB_MAX_JSON_KEY_LEN + 1);
+      for (int j = 0; j < taosArrayGetSize(pTableIdList); ++j) {
+        STableIdInfo *id = taosArrayGet(pTableIdList, j);
+        uint8_t type = getTagJsonType(tsdb, id->uid, sqlExpr->param[0].pz, sqlExpr->param[0].nLen);
+        if(type != TSDB_DATA_TYPE_NULL) {
+          schema->type = type;
+          break;
+        }
+      }
+      tmp += sizeof(TagJsonSSchema);
+    }
+  }
+  return tJsonSchData;
+}
+
+int32_t qCreateQueryInfo(void* tsdb, int32_t vgId, SQueryTableMsg* pQueryMsg, qinfo_t* pQInfo, uint64_t qId, void** tJsonSchema) {
   assert(pQueryMsg != NULL && tsdb != NULL);
 
   int32_t code = TSDB_CODE_SUCCESS;
@@ -168,7 +200,7 @@ int32_t qCreateQueryInfo(void* tsdb, int32_t vgId, SQueryTableMsg* pQueryMsg, qi
   assert(pQueryMsg->stableQuery == isSTableQuery);
   (*pQInfo) = createQInfoImpl(pQueryMsg, param.pGroupbyExpr, param.pExprs, param.pSecExprs, &tableGroupInfo,
                               param.pTagColumnInfo, param.pFilters, vgId, param.sql, qId, param.pUdfInfo);
-
+  *tJsonSchema = setJsonTagSchema(tsdb, pQueryMsg->numOfOutput, param.pExprs, param.pTableIdList);
   param.sql    = NULL;
   param.pExprs = NULL;
   param.pSecExprs = NULL;
diff --git a/src/tsdb/src/tsdbRead.c b/src/tsdb/src/tsdbRead.c
index 145da28e2e881f14fdfb37594eae3d5f68499bf0..e982530f90cc206c357d1e926785e78d3ddac916 100644
--- a/src/tsdb/src/tsdbRead.c
+++ b/src/tsdb/src/tsdbRead.c
@@ -4112,5 +4112,16 @@ static int32_t tsdbQueryTableList(STable* pTable, SArray* pRes, void* filterInfo
   return TSDB_CODE_SUCCESS;
 }
 
+uint8_t getTagJsonType(STsdbRepo* tsdb, uint64_t uid, char* key, int32_t len){
+  STable* pTable = tsdbGetTableByUid(tsdbGetMeta(tsdb), uid);
+  void* result = getJsonTagValueElment(pTable, key, len, NULL, TSDB_MAX_JSON_TAGS_LEN);
+  if(result){
+    return *(char*)result;
+  }else{
+    return TSDB_DATA_TYPE_NULL;
+  }
+}
+
+
 
 
diff --git a/src/vnode/src/vnodeRead.c b/src/vnode/src/vnodeRead.c
index e8495cac6d7de10018757876fba3674bda0e6231..f9d61c5b37579c04585c1bd921d9a218ce567cd1 100644
--- a/src/vnode/src/vnodeRead.c
+++ b/src/vnode/src/vnodeRead.c
@@ -239,14 +239,25 @@ static int32_t vnodeProcessQueryMsg(SVnodeObj *pVnode, SVReadMsg *pRead) {
   if (contLen != 0) {
     qinfo_t pQInfo = NULL;
     uint64_t qId = genQueryId();
-    code = qCreateQueryInfo(pVnode->tsdb, pVnode->vgId, pQueryTableMsg, &pQInfo, qId);
+    void* tJsonSchema = NULL;
+    code = qCreateQueryInfo(pVnode->tsdb, pVnode->vgId, pQueryTableMsg, &pQInfo, qId, &tJsonSchema);
 
-    SQueryTableRsp *pRsp = (SQueryTableRsp *)rpcMallocCont(sizeof(SQueryTableRsp));
+    int extSize = 0;
+    if (tJsonSchema != NULL){
+      uint16_t cnt = *(uint16_t*)tJsonSchema;
+      extSize = cnt * sizeof(TagJsonSSchema);
+    }
+    SQueryTableRsp *pRsp = (SQueryTableRsp *)rpcMallocCont(sizeof(SQueryTableRsp) + extSize);
     pRsp->code = code;
     pRsp->qId  = 0;
 
-    pRet->len = sizeof(SQueryTableRsp);
+    pRet->len = sizeof(SQueryTableRsp) + extSize;
     pRet->rsp = pRsp;
+    if (tJsonSchema != NULL){
+      pRsp->tJsonSchLen = htons(*(uint16_t*)tJsonSchema);
+      memcpy(pRsp->tagJsonSchema, tJsonSchema + SHORT_BYTES, extSize);
+      tfree(tJsonSchema);
+    }
     int32_t vgId = pVnode->vgId;
 
     // current connect is broken