Originally Posted by
rkkwan
There's no difference whether you enter/leave by land, air, or sea. You can use your HRP through all borders. If you enter China with a HRP, you absolutely should be leaving China with one.
I know Wikipedia isn't the most reliable source of information, but according to it:
The current permit is a credit card-sized card which facilitates entry into mainland China at any manned immigration checkpoint or through self-service electronic gates (currently available at Hong Kong-Shenzhen,Macau-Zhuhai crossings and Shanghai Pudong International Airport).
(from:
http://en.wikipedia.org/wiki/Home_Return_Permit
So you're sure I'll be okay to leave China via the Guangzhou (Baiyun) Airport with just my HRP?