Line 9-Line 4 Daxing Line-10 Inner Ring-changping line. Query Baidu map, Beijing Fengtai to Changping by subway route is:

1. Take Line 9 at Fengtai East Street and transfer to Line 4 Daxing Line, and stop at 1 1.

2. Secondly, change at Huang Zhuang, Haidian, and take the inner ring of 10 to Xitucheng, 3 stops.

3. Finally transfer to changping line, stop at 15, and get off at Changping. It takes 1 hour and 55 minutes to complete the 29 stops. Subway is a kind of fast, large-capacity and electric traction rail transit built in cities. The train runs on a completely closed line. The lines located in the central city are basically located in underground tunnels, and the lines outside the central city are generally located on viaducts or on the ground.