Due　to　the　buried　structure　of　the　cross　subway　transfer　station,　effect　of　piston　wind　in　the　station　will　influence　fire　smoke　spread　in　underground　platform.　In　this　paper,　large　eddy　simulation　(LES)　method　is　used　to　study　the　fire　simulation　in　a　cross-typed　metro　transfer　station.　Smoke　diffusion,　temperature　and　CO　concentration　distributions,　wind　speed　at　the　stairway　are　predicted　for　different　smoke　control　modes.　Based　on　the　on-site　measurement　results　of　piston　wind　at　platform　in　a　condition　with　non-stopping　train,　the　influence　of　deep　buried　structure　and　piston　wind　effect　on　fire　smoke　spreading　rule　of　underground　platform　is　studied.　Results　show　that　the　buried　structure　of　transfer　station　affects　the　natural　air　supplement　of　the　ground　floor　platform.　The　piston　wind　effect　has　an　adverse　effect　on　the　air　distribution　in　the　fire.　In　addition,　air　supplement　volume　at　stairway　cannot　meet　the　requirements　of　the　standard　of　metro　design.　©　2019　IEEE.