which bus route to take to PEK from 30 Plaza Pinganlixidajie, xicheng district, beijing

You can walk about 350 yards to Chegongzhuang (Exit B of Chegongzhuang subway station) to take aiport shuttle bus line 2 to reach the airport. The shuttle bus runs from Xidan to the airport from 5：00～21：00 every 30 minutes. Chegongzhuang is the first stop after Xidan. Duration is about 70 minutes and ticket fare is CNY24.