Citizens of 53 countries with valid international travel documents and air tickets for a connecting flight with confirmed date of flight and seat for a third country or region can apply for a 72-hour transit visa exemption at ports of entry in Beijing, Shanghai and Guangzhou. 

53 countries include Austria, Belgium, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Italy,  Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland, Russia, the United Kingdom, Ireland, Cyprus, Bulgaria, Romania, Ukraine, Serbia, Croatia, Bosnia and Herzegovina, Republic of Montenegro, Macedonia, Albania, Monaco, Belarus, United States, Canada, Brazil, Mexico, Argentina, Chile, Australia, New Zealand, South Korea, Japan, Singapore, Brunei, the United Arab Emirates and Qatar.
For details, please click the following link: 
https://en.nia.gov.cn/n162/n227/c58934/content.html