Based　on　an　actual　project　in　Beijing,　this　article　investigates　the　effect　of　smoke　control　strategies　on　smoke　extraction　efficiency　under　different　fire　source　locations　of　the　point　smoke　extraction　system　in　extra-long　tunnels　using　Airpak　software.　The　results　show　that　when　a　fire　occurs　in　a　tunnel,　the　smoke　extraction　efficiency　of　the　tunnel　smoke　extraction　system　varies　greatly　depending　on　the　location　of　the　fire　source　and　the　adoption　of　different　smoke　extraction　strategies.　Due　to　the　suction　of　the　smoke　exhaust　shaft　fan,　the　relative　distance　between　the　electric　smoke　exhaust　valve　and　the　entrance　of　the　tunnel　is　close,　which　will　cause　the　smoke　exhaust　valve　within　a　certain　range　to　be　plug-holing,　seriously　affecting　the　smoke　exhaust　effect　of　the　smoke　exhaust　system.　Smoke　exhaust　valve　beyond　this　range,　although　not　occurring　plug-holing　the　smoke　exhaust　efficiency　is　also　relatively　low,　by　changing　the　opening　strategy　of　the　smoke　exhaust　valve　can　effectively　improve　the　smoke　exhaust　valve　plug-holing,　so　as　to　improve　the　smoke　exhaust　efficiency.　©　2023,　The　Author(s).