diff --git a/src/client/src/tscParseInsert.c b/src/client/src/tscParseInsert.c
index 89647324b9e88e04034c136531abc117eb497f33..3b4a06fe4c3c7a9d2405c2253df84087ffe7045e 100644
--- a/src/client/src/tscParseInsert.c
+++ b/src/client/src/tscParseInsert.c
@@ -1084,6 +1084,11 @@ static int32_t tscCheckIfCreateTable(char **sqlstr, SSqlObj *pSql, char** boundC
     if(spd.numOfBound == 1 && pTagSchema[spd.boundedColumns[0]].type == TSDB_DATA_TYPE_JSON){
       char tmp = sToken.z[sToken.n];
       sToken.z[sToken.n] = 0;
+      if(sToken.type != TK_STRING) {
+        tdDestroyKVRowBuilder(&kvRowBuilder);
+        tscDestroyBoundColumnInfo(&spd);
+        return tscSQLSyntaxErrMsg(pInsertParam->msg, "json type error, should be string", NULL);
+      }
       code = parseJsontoTagData(sToken.z, &kvRowBuilder, pInsertParam->msg, pTagSchema[spd.boundedColumns[0]].colId);
       if (code != TSDB_CODE_SUCCESS) {
         tdDestroyKVRowBuilder(&kvRowBuilder);
diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index 180e3d7443fdda08f333363c36c4f5d1eb4864f9..60fc6c2ef4c784735118cc43b81e17f2d43ccddc 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -5867,6 +5867,8 @@ int32_t setAlterTableInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
   const char* msg23 = "only column length coulbe be modified";
   const char* msg24 = "invalid binary/nchar column length";
 
+  const char* msg25 = "json type error, should be string";
+
   int32_t code = TSDB_CODE_SUCCESS;
 
   SSqlCmd*        pCmd = &pSql->cmd;
@@ -6070,6 +6072,10 @@ int32_t setAlterTableInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
       if (tdInitKVRowBuilder(&kvRowBuilder) < 0) {
         return TSDB_CODE_TSC_OUT_OF_MEMORY;
       }
+      if(pItem->pVar.nType != TSDB_DATA_TYPE_BINARY){
+        tscError("json type error, should be string");
+        return invalidOperationMsg(pMsg, "json type error, should be string");
+      }
       code = parseJsontoTagData(pItem->pVar.pz, &kvRowBuilder, pMsg, pTagsSchema->colId);
       if (code != TSDB_CODE_SUCCESS) {
         tdDestroyKVRowBuilder(&kvRowBuilder);
@@ -7492,6 +7498,7 @@ int32_t doCheckForCreateFromStable(SSqlObj* pSql, SSqlInfo* pInfo) {
   const char* msg3 = "tag value too long";
   const char* msg4 = "illegal value or data overflow";
   const char* msg5 = "tags number not matched";
+  const char* msg6 = "json type error, should be string";
 
   SSqlCmd* pCmd = &pSql->cmd;
 
@@ -7689,6 +7696,10 @@ int32_t doCheckForCreateFromStable(SSqlObj* pSql, SSqlInfo* pInfo) {
         return invalidOperationMsg(tscGetErrorMsgPayload(pCmd), msg5);
       }
       tVariantListItem* pItem = taosArrayGet(pValList, 0);
+      if(pItem->pVar.nType != TSDB_DATA_TYPE_BINARY){
+        tscError("json type error, should be string");
+        return invalidOperationMsg(tscGetErrorMsgPayload(pCmd), "json type error, should be string");
+      }
       ret = parseJsontoTagData(pItem->pVar.pz, &kvRowBuilder, tscGetErrorMsgPayload(pCmd), pTagSchema[0].colId);
       if (ret != TSDB_CODE_SUCCESS) {
         tdDestroyKVRowBuilder(&kvRowBuilder);
diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index c21b32647628a9aeeddc3887b4050aa767171013..0f9e33991d6c47f3b91c62f431abb12e081091d4 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -5234,11 +5234,10 @@ end:
 }
 
 int parseJsontoTagData(char* json, SKVRowBuilder* kvRowBuilder, char* errMsg, int16_t startColId){
-  cJSON *root = cJSON_Parse(json);
+  cJSON *root = cJSON_Parse(json->pz);
   if (root == NULL){
     tscError("json parse error");
     return tscSQLSyntaxErrMsg(errMsg, "json parse error", NULL);
-
   }
 
   int retCode = 0;
diff --git a/tests/pytest/stable/json_tag.py b/tests/pytest/stable/json_tag.py
index 2d67b486a53dd469fa8b22fb2c16dad741d6914b..edd6649f29817e7c7461412880198839fd9562c8 100644
--- a/tests/pytest/stable/json_tag.py
+++ b/tests/pytest/stable/json_tag.py
@@ -49,10 +49,16 @@ class TDTestCase:
         print("==============step3")
         tdLog.info("alter stable add tag")
         tdSql.execute(
-            "ALTER STABLE db_json_tag_test.jsons1 add COLUMN tag2 nchar(20)")
+            "ALTER STABLE db_json_tag_test.jsons1 add tag tag2 nchar(20)")
 
         tdSql.execute(
-            "ALTER STABLE db_json_tag_test.jsons1 drop COLUMN jtag")
+            "ALTER STABLE db_json_tag_test.jsons1 drop tag jtag")
+
+        tdSql.execute(
+            "ALTER TABLE db_json_tag_test.jsons1_1 SET TAG jtag=4")
+
+        tdSql.execute(
+            "ALTER TABLE db_json_tag_test.jsons1_1 SET TAG jtag='{\"sex\":\"femail\",\"age\":35}'")
 
     def stop(self):
         tdSql.close()