Research conclusions:The open ventilation system is used in environment control system for the metro station in cold regions with open － close operational mode．A piston air tunnel and a bypass tunnel are setted up at each end of metro station． An electric start － stop device is installed in the space of about 500 mm between the top of high － security doors and the structural panel．In winter and summer，this device is closed to fully disconnect the track area with the public area of station for reducing the cold air volume from the station entrance and exit caused by the piston air．From the result of the simulation calculation it can be seen this environment control system program satisfies the climate features of the cold region