There is a vocational skills training school at Qingyuan intersection in Daxing, where you can learn to take a bus at Ma Ju Bridge, transfer to a long-distance station and get off at Qingyuan intersection. The telephone number is 366 957 937 679, which is the southwest corner of the intersection.
Or you can go to Yizhuang Town Government and other small 15 roads and get off at Qingyuan Road.