Fire　accidents　in　a　cross　interchange　subway　are　analyzed.　At　present,　the　primary　focus　of　subway　evacuation　behavior　analysis　is　mainly　concern　on　normal　state;　evacuations　in　case　of　fire　have　rarely　been　under　research.　The　relationship　of　soot　density　and　extinction　coefficient　of　fire　smoke　with　average　walking　speed　of　occupants　is　linearly　dependent.　In　this　paper,　FDS+Evac　program　is　used　to　simulate　the　evacuation　in　a　fire　scenario.　It　has　been　found　that　not　only　some　occupants＇　evacuation　routes　become　longer,　but　also　the　utilization　of　some　of　the　exits　is　reduced,　therefore　congestion　is　caused　at　other　safe　exits　in　a　cross　subway　station　fire.　(C)　2012　The　Authors.　Published　by　Elsevier　Ltd.