As a US pilot you should avoid contracting through a US company overseas. They have to issue you a 1099 and you will be on the hook for Social Security Tax/FICA by having to file a 1040 Sched C - self employed income.
Rishworth, Parc and Aeropersonnel all offer various China employment deals right now - all seem pretty standard - $13-18k a month for qualified A320 Captains who can get through all the testing and whatnot - salary, living and bonus structures vary of course.
Some pay you thru the contractor, some pay the contractor a finder fee and you are contracted directly with the company.
You should consult a qualified tax professional who deals with expat pilot issues for more info. Timing of the contract, time overseas, who you are working for, etc are all important factors that should be considered.