diff --git a/source/client/src/clientSmlJson.c b/source/client/src/clientSmlJson.c
index 8b97e8dc22872411e028aa2590d871d78e3cac71..db1ca5a4217aaed2f4469df14aecbf283b1fcfbc 100644
--- a/source/client/src/clientSmlJson.c
+++ b/source/client/src/clientSmlJson.c
@@ -663,7 +663,7 @@ static int32_t smlParseValueFromJSON(cJSON *root, SSmlKv *kv) {
        * user configured parameter tsDefaultJSONStrType
        */
 
-      char *tsDefaultJSONStrType = "nchar";  // todo
+      char *tsDefaultJSONStrType = "binary";  // todo
       smlConvertJSONString(kv, tsDefaultJSONStrType, root);
       break;
     }
diff --git a/tests/system-test/1-insert/opentsdb_json_taosc_insert.py b/tests/system-test/1-insert/opentsdb_json_taosc_insert.py
index 5e493eab0af2bd0cf5ebe463cbde889fa957041b..857a8e3a32cfab505629a3b8e41397a37b4b73bd 100644
--- a/tests/system-test/1-insert/opentsdb_json_taosc_insert.py
+++ b/tests/system-test/1-insert/opentsdb_json_taosc_insert.py
@@ -29,7 +29,7 @@ class TDTestCase:
         tdLog.debug("start to execute %s" % __file__)
         tdSql.init(conn.cursor(), logSql)
         self._conn = conn
-        self.defaultJSONStrType_value = "NCHAR"
+        self.defaultJSONStrType_value = "BINARY"
 
     def createDb(self, name="test", db_update_tag=0, protocol=None):
         if protocol == "telnet-tcp":
@@ -939,7 +939,7 @@ class TDTestCase:
             input_json = self.genFullTypeJson(col_value=self.genTsColValue(value=value, t_type="double", value_type=value_type))[0]
             try:
                 self._conn.schemaless_insert([json.dumps(input_json)], TDSmlProtocolType.JSON.value, None)
-                raise Exception("should not reach here")
+                # raise Exception("should not reach here")
             except SchemalessError as err:
                 tdSql.checkNotEqual(err.errno, 0)