do u know where i can buy chinese subtitle and english subtitle?
No I don't.
I don't think you can buy subtitiles or chinese text in other words for the game. I don't even know about all that since I only play U.S. versions. I don't even know if the RO sold in China has chinese text, no idea.
The NA version of the game is in English text, there mainly are no talking NPC's it's all english text. So there are no subtitles to translate anyway.
Your best bet is www.play-asia.com
Here is a link to what you're looking for: