when logon sqlplus got garbled

When I use cmd and key in

sqlplus / as sysdba

then got result as below

C:\Users\Administrator>sqlplus / as sysdba

SQL*Plus: Release 11.2.0.1.0 Production on 星期五 11月 19 14:41:52 2021

Copyright (c) 1982, 2010, Oracle. All rights reserved.

?s線到: (Here need show 連線到)

Oracle Database 11g Release 11.2.0.1.0 - 64bit Production

I already do the setting as below

To set the NLS_LANG environment variable for Oracle databases

1. Determine the NLS_LANG value.
   1. In the data warehouse database, run the command
2. SELECT * FROM V$NLS_PARAMETERS
   1. Make a note of the NLS_LANG value, which is in the format [NLS_LANGUAGE]_[NLS_TERRITORY].[NLS_CHARACTERSET].
   2. For example: American_America.UTF8