One is in Jiangdong, take bus No.20 and get off at Ai Wu Station.
One is near Yiwu Theatre, at the intersection of Xinma Road and Beimen Street. There seems to be no car in Futian market. Go to No.9 Station of Hong Kong Hotel and walk towards the old railway station (next to Xinma Road Vegetable Market) and you will see it.
There is also a small bookstore: Xiaoxi Bookstore, which seems to be written by Ai Qing, and the books are relatively complete. Opposite Chaoyangmen, Chengzhong Middle Road, take 122 and get off at Yifan Hotel (the previous stop in Bai Jie).