I am going from the Beijing Airport to Shatan Houjie. I will take the Airport Express to Dongzhimen.

Upon arrival by airport express to Dongzhimen, you can take subway line 2 to Chaoyangmen, you should take the Exit G. Then walk about 500 yards to Chaoyangmen Inner bus stop to take the bus No. 58 to Jingshan Dongmen Station. Then walk about 80 yards, you will reach the Shatan Houjie.

In fact, you have a simpler way. Take the shuttle bus line 3 to Chaoyangmen directly from the airport. Then take a taxi to Shatan Houjie, and the taxi fare would be CNY25 around.