As of June 2015, 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 Capital International Airport, Shanghai Hongqiao International Airport, Shanghai Pudong International Airport, Guangzhou Baiyun International Airport，Chengdu Shuangliu International Airport，Chongqing Jiangbei International Airport，Shenyang Taoxian International Airport，Dalian Zhoushuizi International Airport，Hangzhou Xiaoshan International Airport，Guilin Liangjiang Airport，Kunming Changshui International Airport，Xi’an Xianyang International Airport, Xiamen Gaoqi International Airport, Haerbin Taiping International Airport, Wuhan Tianhe International Airport, and Tianjin Binhe International Airport.
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
You may click here for some Chinese Border Control Autorities' contact information.