Tipping practice when travelling to China - It is a common practice for visitors to tip the tour guide and driver in recognition of their good service. A hotel bellboy expects your tips as well. It is not customary to leave tips at hotels or local restaurants as the bill usually includes a 10-15% service charge.
For the tips to the tour guide. USD10 to USD15 per day is considered to be appropriate. Anyway it is up to you for the tipping.