This　paper　has　studied　numerically　and　experimentally　simulation　of　the　airflow　characteristic　in　two　ventilating　and　smoke　exhausting　models　in　a　typical　island　platform　station　fire　of　Beijing　subway　line　2.　The　smoke　flow　quality,　the　temperature　distribution　characteristic　as　well　as　the　smoke　density　distributed　characteristic　are　predicted　and　analyzed　when　the　fire　occurs　in　the　subway　using　CFD　method,　And　it　is　to　analyze　and　compare　the　smoke　diffusion　and　temperature　distribution　characteristic　in　the　two　ventilating　and　smoke　exhausting　models　when　the　fire　occurs　in　the　middle　of　platform.　From　the　present　numerical　simulation　results,　it　is　clarified　that　it＇s　to　control　smoke　diffusion　better　when　the　fans　of　station　is　exhausted　and　the　fans　of　two　tunnels　on　each　side　is　also　exhausted.