There are two channels at the airport Customs, red and green. If you have nothing to declare, go through the green channel, otherwise take the red channel. If you are not sure which channel you should take, then you should take the red channel. If you take things listed on the Customs Luggage Declaration Form in the red box such as computers, cameras, video cameras, gold and silver, printed or recorded materials, or anything more than you need during your travel in China, or something that you will not take out of China when you leave, you have to fill in the Customs Luggage Declaration Form which you are given on the plane or at the Customs. Then you take the red channel and the Customs officer will check it to see whether you have to pay duty or you have to deposit the things at the Customs, or whether you can take them into China but have to take them out on your departure. Please keep the stamped form with you and do not lose it, because you will be asked to give it back to the Customs officer for checking on your departure. If you do not take out all the things that you have brought in and you filled in the form, you will probably be asked to pay duty. The following items are not allowed to be taken into China 1.Weapons, ammunition or explosives; 2.Forged currencies or forged valuable securities; 3.Printed, audio, video, computerized and other materials which are harmful to China's political, economic, cultural and ethnic life; 4.Various poisons; 5.Opium, heroin, marijuana and other addictive drugs; 6.Plants, animals or other products which may carry diseases, viruses, parasites, etc., 7.Foodstuffs, medicines or other products which may cause harm to human or animals, which come from areas with epidemics or which may spread diseases or contamination.