Bus route: Metro Line 9 → Metro 14, the whole journey is about 1 1.9 km.

1. Walk about 250 meters from the National Library of China and arrive at the National Library Station.

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

3. Walk about150m and transfer to the subway 14 line.

4. Take the subway 14 line, pass 1 station and arrive at Dajing Station.

5. Walk about 350 meters to Fengtai Sports Center.

I hope my answer can help you, and I wish you a happy life ~