I am in beijing.stay in kung zhu fen,how i can go to great wall ? by a subway / bus? tnx a lot

Winnie, you are suggested to visit Badaling which is the most famous section of the country.
You stay at Gongzhufen, right? Take metro line 1 from Gongzhufen to Fuxingmen Station, and change to metro line 2 to Jishuitan Station, Exit B2. Walk east for about 500 yards to Deshengmen Station. Upon arrival, take bus line 877 to Badaling Great Wall. :)