In　this　paper,　the　highly　effective　three　dimensional　evacuation　software　STEPS　(simulation　of　Transient　Evacuation　and　Pedestrian　movements)　is　used　to　calculate　the　required　safe　evacuation　time　(RSET)　under　different　conditions　in　a　subway　transfer　station.　Several　scenarios　has　been　designed　where　fire　happed　at　a　certain　location　and　smoke　propagation　condition　has　been　simulated　in　advance.　Then　the　processes　of　evacuation　is　analyzed　and　that　whether　they　are　safe　evacuations　or　not　is　determined.　It　has　been　found　that　the　stairs　toward　the　lobby　floor　on　both　sides　of　the　platform　are　bottlenecks　of　evacuation.　Some　advices　about　evacuation　are　given　finally　for　reduce　the　evacuation　period.　(C)　2012　The　Authors.　Published　by　Elsevier　Ltd.