Replying to [oldie]:
if you have to be collected from the airport:
carry a mobile
have contact numbers for people in china
check the factory well
dont go on you own
tell other factories who has picked you up, make sure the seller knows this too.
dont carry lots of cash
dress normal
when the driver picks you up, get them first to call the contact at the factory and hand you the phone so you can talk to them, let them know all is ok.
can text the car reg to a person in china, if they dont see you can contact the police.
I am sure you dont need to do all of them, but some would be a good idea