Take the subway and take the 10 and 14 lines. According to Baidu map, the distance from Sanlitun to Beijing South Railway Station is17km, and it takes 55 minutes by subway 10 and 14.

1. First walk from Sanlitun 1.5km to Tuanjiehu subway station.

2. Secondly, take the 10 line from Tuanjiehu subway station and take 7 stops to He Shili subway station.

3. Finally, take the 14 line from He Shili subway station to Beijing South Railway Station, and you need to take 5 stops.