The　effect　of　smoke　control　for　a　multi-source　fire　scenario　in　a　cross-type　interchange　subway　station　had　been　investigated　by　the　numerical　method　in　this　paper.　Two　fires　occurd　at　the　same　time　on　the　second　and　third　underground　floor.　The　fires　were　designed　as　fast　Q-t2　fire　with　the　peak　heat　release　rate　of　2　MW.　Two　types　of　fire　emergency　ventilation　modes　were　selected.　Air　was　supplied　on　the　first　lobby　floor　and　smoke　was　exhausted　on　both　second　and　third　underground　floor　in　these　two　ventilation　modes.　The　difference　between　the　two　modes　was　whether　the　tunnel　smoke　exhaust　system　on　the　third　floor　was　operating.　Numerical　results　show　that　smoke　is　controlled　effectively　on　the　second　underground　floor　in　both　modes.　Combing　the　underground　third　floor　with　tunnel　ventilation　system　by　opening　PSD　can　increase　the　downward　air　flow　velocity　and　decrease　the　air　temperature　at　staircases　near　the　fire.　Time　during　which　the　staircase　near　fire　can　be　used　for　evacuation　is　increased.　Good　smoke　control　effect　for　interchange　station　can　be　got.