diff --git a/packaging/cfg/taos.cfg b/packaging/cfg/taos.cfg
index e42212ff0f55420dfa5f23638a69439be795e43a..59f87b0a1f8d3aa192383457a85e1d53b1a3bf54 100644
--- a/packaging/cfg/taos.cfg
+++ b/packaging/cfg/taos.cfg
@@ -299,8 +299,8 @@ keepColumnName            1
 # percent of redundant data in tsdb meta will compact meta data,0 means donot compact
 # tsdbMetaCompactRatio    0
 
-# default string type used for storing JSON String, options can be binary/nchar, default is binary
-# defaultJSONStrType      binary
+# default string type used for storing JSON String, options can be binary/nchar, default is nchar
+# defaultJSONStrType      nchar
 
 # force TCP transmission 
 # rpcForceTcp        0
diff --git a/src/common/src/tglobal.c b/src/common/src/tglobal.c
index c1a254b4ebd5fdfe1d29e02ab7cacbe3195058f1..ea23d76c70cb3a24bc2c6bcb73d26c9f2bfad8e1 100644
--- a/src/common/src/tglobal.c
+++ b/src/common/src/tglobal.c
@@ -289,7 +289,7 @@ char     Compressor[32] = "ZSTD_COMPRESSOR";  // ZSTD_COMPRESSOR or GZIP_COMPRES
 int8_t tsDeadLockKillQuery = 0;
 
 // default JSON string type
-char tsDefaultJSONStrType[7] = "binary";
+char tsDefaultJSONStrType[7] = "nchar";
 char tsSmlChildTableName[TSDB_TABLE_NAME_LEN] = ""; //user defined child table name can be specified in tag value. If set to empty system will generate table name using MD5 hash.
 
 int32_t (*monStartSystemFp)() = NULL;