The　floor　field　model　is　modified　by　additionally　considering　the　pedestrians＇　perception　capacity　of　the　exit　width　to　simulate　the　evacuation　process　in　a　room　with　multiple　exits.　The　simulation　results　show　that　the　evacuation　time　is　sensitive　to　the　cognition　coefficient,　and　it　is　decreased　provided　the　coefficient　is　taken　into　account.　The　asymmetrical　coefficient　of　the　new　arrangement　for　the　cells　in　the　evacuation　room　is　used　to　verify　the　effect　of　cognition　coefficient.　Furthermore　the　relationship　between　the　minimal　points　of　evacuation　times　and　unbalance　coefficients　is　investigated.　©　right.