Oracle Chinese garbled problem

I installed oracle today, and there is a problem of Chinese garbled characters when entering and exiting sql with Chinese on plsql

in reference

http://www.jb51.net/article/53078.htm

After the document, the problem is still not solved

Add environment variables based on this document

system variable

NLS_LANG

SIMPLIFIED CHINESE_CHINA.ZHS16GBK

Corresponding to plsql tool--"Home--"Character set gb2312

Modify the registry:

Enter the registry, click HKEY_LOCAL_MACHINE --->SOFTWARE ---> ORACLE--->home (the editor installed Oracle 11g, which is displayed as KEY_OraDb11g_home1 here), find NLS_LANG, and check whether the numerical data is: SIMPLIFIED CHINESE_CHINA. ZHS16GBK

Problem solved after