take bus No.77 and transfer to metro lines 6 and 14. According to the navigation information, take bus No.77 from Gengzhuang Bridge North and get off at Tongzhou Beiguan Station, walk 282 meters to Tongzhou Beiguan, take subway line 6, get off at Jintai Road, transfer to subway line 14 and get off at Laiguangying, then walk 517 meters to the finish line.