An　extended　multi-grid　model　is　proposed　to　study　fire　evacuation　in　a　two-exit　room.　The　exit　selection　based　on　random　utility　theory,　as　well　as　the　pedestrian　movement　in　fire,　is　investigated.　The　effects　of　different　occupant　types,　the　utility　threshold,　heat　release　rate　of　fire,　burning　materials　and　pre-movement　time　on　evacuation　are　discussed.　The　results　show　that　active　occupants　are　beneficial　for　evacuation　because　of　their　guidance　to　the　herding　pedestrians,　whereas,　the　existence　of　conservative　is　not　always　good　for　evacuation;　a　proper　frequency　of　changing　target　exit　can　relieve　congestion　and　optimize　evacuation　process;　evacuation　time　is　not　monotonically　increasing　with　the　increment　of　heat　release　rate　due　to　acceleration　when　pedestrians　feel　the　incentive　of　high　temperature　within　limit;　the　effect　of　burning　material　on　evacuation　is　related　to　its　thermal　physical　properties;　the　pre-movement　time　aggravates　the　difficulty　of　evacuation　due　to　the　bad　visibility　and　high　CO　concentration　in　fire　situation.　The　study　may　be　useful　to　predict　exit　selection　and　pedestrian　movement　process,　and　then　give　suggestions　to　guide　pedestrian　evacuation　under　fire　emergency.　©　2018　Elsevier　Inc.