In the middle of Haidian Book City Pedestrian Street, on the west side of the street. The gables are not big. It should be easy to find between two Internet cafes.

The nearest stations are Haidian Bridge East and Haidian Bridge North. Get off and walk to Haidian Bridge, and enter from the north entrance of the pedestrian street.

If you take the station of Beijing Seismological Bureau, get off and go north, and enter from the south entrance of pedestrian street.

If you take the subway or get off at a station like Huang Zhuang, you'd better ask for directions, because it's not very close.

PS: Haidian Bookstore is a big gray building, which is easy to find after getting off the bus.