Let me contribute to my experience working in China for almost 1 year.
Allowance:
Allowance = RMB13000/mth
Accommodation = Provided by company. Includes utilities, internet.
Transport allowance = RMB1000/mth
Flying back to home country = Free every quarter
Winter clothing allowance = RMB5000 one time off
One time settling allowance = RMB5000 one time off
Visa = Provided by company

Expenditure:
Food = Lunch provided by company. In fact if i wanted to, I can have my breakfast, lunch & dinner in company. Otherwise breakfast is about RMB20/day. Dinner ~ RMB50/day. Total for 1 month = RMB2100 ~ 3000
Phone bill = RMB150/mth
Misc = RMB 2000 ~ 4000 (for shopping & travel within China)

All this without touching my basic salary at home.