China allows visa-free transit of up to 240 hours for travellers from 57 countries, who may move within permitted areas of 24 provincial-level regions and enter through any of 65 ports. The list includes the United States, Canada, Brazil, Argentina, Chile, Mexico, Australia, New Zealand, the United Kingdom, most of Europe, Japan, South Korea and Singapore. Business visits, tourism and family visits are allowed. Work, study and news reporting are not, and need a visa.
The condition that catches people is the onward ticket. The traveller must hold a confirmed onward ticket, with a seat and a departure date, to a third country or region within the 240 hours. Travellers apply on arrival at the port, and border officers decide on the spot. A passport valid for at least three months is needed.