there're 2 types of nls parameter :
1st is client nls parameter
if only want to do some queries in client and use Chinese character,chanage the config of client nls parameters:
regedit--->\HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\HOME0\nls_lang
change to "SIMPLIFIED CHINESE_CHINA.ZHS16GBK"
2nd is server nls parameter
it's more difficute then 1nd.show oracle document NLS department.