For the check-in luggage, passengers holding an adult fare or half fare ticket are entitled to a free baggage allowance of 40kg (88 pounds) for first class, and 30kg (66pounds) for business class, while20kg (44 pounds) for economy class. No free baggage allowance is granted to infants. If your luggage is over the limitation, you will need to pay for the excess weight, and some of the airports in China are quite strict with this.

Note:
Articles which cannot be taken as baggage: flammable, explosive, corrosive, poisonous, radioactive, polymerizable and magnetized materials, and arms, sharp or lethal weapons as well.
Articles which cannot be packed in the checked baggage : important documents, classified materials, diplomatic mail bags, negotiable securities, currencies, money orders, valuables, vulnerable perishables and articles and other articles needed in the special custody of somebody. The carrier will not be liable for the loss of or damage to the aforementioned.

Articles which should be put in check-in baggage: knife, scissors and bottled or tinned alcohol/ wine.

The checked baggage should be packed perfectly with a lock, toed up solidly and be able to withstand pressure to a reasonable extent. Carriers may refuse to accept for carriage if the baggage packing does not meet to the requirements.

The carrier will be liable to compensate for the loss of or damage to the checked baggage due to the carrier's fault. The exact amount of compensation is decided and managed by the carrier and usually it will not satisfy you, so always have insurance for your luggage before departure for China.

Passengers and their baggage (including checked and carry-on baggage) are subject to the security inspection before boarding the aircraft.