Dear He,
I was checking the ITT VIS data base for a Tech Tip on 2-Byte Unicode Characters In IDL Graphics Windows, where the Chinese Fonts are part of. I found the following link that I think could be related with your problem:
http://www.ittvis.com/ser...echtip.asp?ttid=3519
This Tech Tip explain how to display 2-byte Unicode characters on IDL "draw windows" and demonstrates approaches in both Direct and Object Graphics.
I'm not sure if the behavior that you are experience is a bug, but could this Tech Tip be of any help?.
Greetings,
Fernando