Due　to　the　faultiness　of　smoke　management　system　and　fire　protection　in　Beijing　subway　line　1　and　2,　the　disaster　prevention　need　to　be　studied.　The　paper　analyses　the　actuality　of　ventilation　and　smoke　management　system　by　an　on-site　investigation　and　experimental　test　of　a　typical　station　and　find　out　some　inconsistent　with　the　norms　and　improvement　needed.　The　feasibility　of　alteration,　according　to　assessment　of　the　status,　was　validated　by　CFD　simulation.　Ultimately,　it　meets　the　requirements　for　safety　for　smoke　control　system　of　alteration　station.