It　is　challenging　to　control　smoke　in　the　case　of　a　train　fire　occurred　in　the　subway　depot　with　a　complex　internal　structure.　In　this　paper,　the　effect　of　door　opening　state　on　smoke　behavior　characteristics　induced　by　subway　depot　fire　scenario　was　investigated.　A　series　of　numerical　simulation　were　conducted　by　Fire　Dynamics　Simulator　(FDS)　software.　Three　key　parameters　were　analyzed　corresponding　to　the　temperature,　visibility　and　CO　concentration　for　evaluating　smoke　propagation　respectively.　Results　show　that　temperature　distribution　and　CO　concentration　at　2　m　height　inside　the　train　with　train　door　opening　state　are　lower　than　those　with　the　train　door　closed.　However,　visibility　at　2　m　height　inside　the　train　shows　the　opposite　trend.　The　results　can　provide　reference　in　the　ventilation　system　design　and　emergency　evacuation　scheme　for　the　subway　depot.　©　Published　under　licence　by　IOP　Publishing　Ltd.