Bus route: Metro 1 Line → Metro Line 9 → Metro Line 4 Daxing Line, with a total length of about 18.3 km.

1, take the subway 1 line from the ancient city, and arrive at the military museum station after 7 stops.

2. Walk about 270 meters and transfer to Metro Line 9.

3. Take Metro Line 9, pass three stops and arrive at the National Library Station.

4. Take Daxing Line of Metro Line 4, pass 2 stops and arrive at Renmin University Station.