How do I get to Wangfujing Street from Beijing airport (Terminal 2)?

Besides taxi, no direct transporation can take you to travel for the journey at that time. Well, I suggest you take airport shuttle bus line 2 Night Line, which operates from 24:00 to the arrival of the last flight, to BJ Railway Station, which is 2km or aorund from your destination then. You can take a taxi to reach in a few minutes.