Emergency　ventilation　systems　are　commonly　used　for　smoke　control　during　tunnel　fires.　For　the　transverse　ventilation　system,　high　efficiency　for　fire　safety　could　be　obtained　by　confining　the　smoke　within　certain　zones.　In　this　paper,　a　new　system　with　simultaneous　water　mist　screen　and　transverse　ventilation　system　(WMSTV　system)　is　proposed.　In　the　WMSTV　system,　water　mist　screens　are　used　to　confine　smoke　from　spreading　widely,　which　assists　the　smoke　exhausting　process　of　the　transverse　ventilation　system.　Numerical　method　is　used　for　investigation　in　this　paper.　The　effects　of　natural　and　transverse　ventilation　systems　without　water　mist　are　also　investigated　for　comparison.　Numerical　results　show　that　the　WMSTV　system　can　confine　the　fire　and　smoke　effectively　and　the　environment　inside　the　confined　zone　would　be　suitable　for　occupants　evacuation　and　firefighting.　The　system　can　be　regarded　as　a　feasible　strategy　for　smoke　control　in　tunnels.　(C)　2017　Elsevier　Ltd.　All　rights　reserved.