Hello Dragon English,
Currently we do not offer any distribution in China. The Distribution Channels we have are Canada, United States, United Kingdom and Singapore. However, it is not to say that may be an option in the future.
If you select the main Distro as United States - English. You will be able to select Targeting in China.
You will be able to do this by going into Edit Campaign Settings > Under Campaign Targeting > Click Edit
There will be an option in there to select China.
Thank you.