1. Take the subway from Fengtai Station 10, get on the bus at Liuliqiao after 3 stops, take subway line 9, and arrive at the National Library after 6 stops.

2. Take Daxing Line of Metro Line 4 at the National Library, pass 1 station and arrive at Beijing Zoo. According to Baidu map, the distance from Fengtai Station to Beijing Zoo is 12.9 km, which takes 40 minutes and passes through 10 stations.