It is a common working procedure that the shield machine should cross the completed station to get to the next section. It is a topic worth of considering how to cross the station fast, economically and effectively so as to ensure the schedule of the works and the safety of the equipment. The construction technique of the shield machine  HERRENKNECKT S285  crossing  Beigongmen station of No.20 bid section of line 4 of Beijing Metro is presented in the paper.