Baggage allowances for domestic flight in China

 It depends entirely on which airline you use and what class you are flying. Normally, the agent where you booked flights will provide you the baggage allowances. For example, ChinaTravelDepot.com always confirms you a flight reservation with baggage allowances.

Information below is just the general stipulation issued by CAAC (General Administration of Civil Aviation of China). Different Airlines may have different standards for free checked luggage.

Carry-on Luggage
Passengers traveling first class that hold adult or child tickets are permitted to carry on two pieces of hand baggage. For business or economy class passengers, only one piece of carry on baggage is allowed. Your hand baggage should be less than five kilograms (about 11 pounds) in total and any piece must have dimensions no larger than 20×40×55 centimeters (8×16×22 inches). Any items that exceed these criteria are treated as checked luggage.

Checked Luggage allowance
Except for infant ticket holders, passengers who hold an adult or half-price ticket (for a child) is allowed to take a certain amount of checked luggage for free. The limitation is below:

 First Class (F)    40 kilograms (88 pounds)     Two pieces

Business Class (C)    30 kilograms (66 pounds)     One piece

Economy Class (Y)   20 kilograms (44 pounds)     One piece

Each piece of checked luggage should not exceed 50 kilograms in weight (110 pounds) and 40×60×100 centimeters (16×24 ×39 inches) in size.
In addition each passenger is allowed to have the following things carried on for free:
 a gripesack
 an overcoat or raincoat; a travel blanket
 an umbrella or a walking stick
 pocket-sized camera
 a miniature telescope
 reading matter for the flight
 food for an infant during the flight
 a bassinet
 folding wheelchair, or a pair of crutches, and artificial limbs
 a notebook PC
Other items, such as a backpack, attaché case, typewriter, portable radio, powder box, hatbox, good-sized camera and books (not for reading on the plane), can not be taken as carry-on luggage above your free allowance, and will be treated as checked luggage.

Overweight Luggage
If your luggage is overweight, the excess amount will incur an additional charge reckoned by distance and weight: Generally, 1 kilogram (2.2 pounds) costs 1.5% of a full economy-class airfare (one way, adult ticket).