According to Baidu map query, the steps of taking a bus from Beijing Railway Station to Shunyi Greenland and then to Building 3 of Southern International Zone are as follows:

1. From Beijing Railway Station, take the outer ring of Metro Line 2 and arrive at Dongzhimen after 4 stops.

2. Take the subway line 13 from Dongzhimen and arrive at Wangjing West after 4 stops.

3. Take the subway line 15 from Wangjing West, pass 8 stops, reach Houshayu, and walk about 860 meters to Qi Hang International South Zone 1 Building in Shunyi Greenland.