A　mathematical　model　has　been　built　and　Large　Eddy　Simulation　(LES)　is　adopted　to　predict　smoke　movement　in　the　tunnel　between　the　Ji-Shuitan　and　Gu-Lou　subway　stations.　This　tunnel　is　a　representative　subway　tunnel　between　two　stations　in　the　loop　line　of　Beijing　Subway　Systems.　The　smoke　species　mass　concentration　distributions　at　different　height,　smoke　horizontal　movement　distance,　spreading　velocity　under　different　operating　schemes　of　tunnel　exhaust　fan　are　predicted.　The　smoke　exhausted　effects　of　tunnel　ventilation　fan　are　testified.　The　results　show　that　the　existed　smoke　exhaust　system　could　reach　the　critical　tunnel　ventilation　velocity　under　5MW　fire　condition　and　smoke　layer　could　be　kept　at　a　safety　height　for　passenger＇s　evacuation.　The　simulated　results　can　be　taken　as　reference　for　the　tunnel　reconstruction　and　establishing　passenger　evacuation　scheme.