From Beijing Capital International Airport:
Visitors can either take a cab or the airport bus to city center. Taxis should only be taken from the taxi station at the airport; tourists are advised not to take taxis whose drivers beckon them as these are not metered. The ride will cost 10 Yuans and an additional 2 per kilometer traveled after the initial 3-4 kilometers.
Alternatively visitors can take the airport bus- there are 6 of these with specified routes. Passengers should choose which bus to board accordingly. These rides cost 16 Yuans.