what bus is going to anheqiao north subway line 4 from west chatue in Beijing?

There is no direct from the west chatue in Haidian District to North Anheqiao Station. If you really want to reach that station, you need to walk on Yongfeng Road to Yuan Qing Lu Nan Kou Station to take the bus line 438 to reach Xiyuan Station and then take the subway line 4 to reach North Anheqiao Station.

If you just want to reach that station and then take the subway line 4, it is just suggested to take the bus line 438 to reach Xiyuan Station and walk to the Xiyuan Subway Station to take the subway.