Bus route: Metro Line 2 → Metro Line 4 → Metro Line 9, with a total length of about 21.4km..

1. Take subway line 2 from Dongsishitiao, pass 6 stops and arrive at Xizhimen Station.

2. Take Daxing Line of Metro Line 4, pass 2 stops and arrive at National Library Station.

3. Take Metro Line 9, pass 7 stops and arrive at Qilizhuang Station.