Chengdu Changcheng expressway is from Chengdu, Sichuan Province to Changdu, Tibet Autonomous Region. It passes through Dujiangyan City, Wenchuan County, Li County, markang City, Luhuo County, Ganzi County, dege county and Jiangda county. From east to west, it is composed of several completed, under construction and proposed expressways.
Chengdu Changdu expressway, hereinafter referred to as Chengdu Changdu expressway, also known as Chengdu Changdu expressway. China's national expressway network number: g4217, is a new national expressway. Chengdu Changdu Expressway starts from Chengdu City, Sichuan Province, passes through Dujiangyan City, Wenchuan County, Li County, markang City, Luhuo County, Ganzi County, dege county and Jiangda County, and finally arrives at Changdu City, Tibet Autonomous Region.
On June 20, 2013, the Ministry of transport of the people's Republic of China issued the national highway network plan (2013-2030), which is also known as "71118 project". On the basis of "7919 project", several connecting lines are added, including Chengdu Changdu Expressway (hereinafter referred to as "Chengdu Changdu expressway"), numbered "National Expressway g4217".