Hi, there is no bus running from the airport to the National Stadium directly. So, you could take the airport express to arrive at San Yuan Qiao and then transfer to subway Line 10, and get off at Bei Tu Cheng. Out of the subway station, you could take the city-bus 380, 839to to arrival at the National Stadium.

From the National Stadium, you could take the bus No.82 to reach Tiananamen and then transfer to 20, 59 and 37 to arrive at Wangfujing.