The　evacuation　of　crowd　out　of　buildings　is　affected　by　many　factors,　such　as　the　emergency　environment,　the　architectural　compositions　and　the　evacuees＇behaviors,　etc.　It　is　very　important　to　identify　the　influence　mechanism　and　degree　to　ensure　a　safe　evacuation.　With　the　help　of　software,　buildingEXODUS,　the　crowd　evacuation　in　a　subway　station　was　simulated.　Some　influence　parameters　were　quantitatively　analyzed,　including　the　walking　speed　and　so　on.　The　results　clearly　prove　that　different　parameters　have　different　effects　on　the　crowd　evacuation.　And　even　for　the　same　parameter,　the　influence　degree　may　be　changed　for　different　building　types.　Based　on　the　above　research,　four　parameters　i.　e.　,　exit　flow　rate,　evacuees＇number,　walking　speed　and　evacuees　＇pre　-　movement　time　are　identified　as　prominent　parameters,　which　significantly　influence　the　evacuation　time.　Therefore,　if　the　four　parameters　are　appropriately　controlled,　the　reliability　of　evacuation　safety　can　be　improved.