Subway　station　structures　near　coast　are　at　risk　of　corrosion　caused　by　chloride,　resulting　in　material　and　structural　component　deterioration　over　time　and　impacting　overall　performance　during　earthquakes.　This　study　proposes　a　numerical　framework　for　the　time-dependent　seismic　fragility　analysis　of　subway　station　structures,　considering　chloride-induced　corrosion,　based　on　the　IDA　method.　This　study　utilizes　finite　element　simulations　of　typical　subway　station　structures　in　Qingdao,　Shandong,　China,　focusing　on　nonlinear　dynamic　interactions　between　soil　and　structure,　as　well　as　the　impact　of　chloride-induced　corrosion　on　aging　effects.　The　time-　dependent　damage　states　within　subway　station　structures　are　determined　through　a　nonlinear　static　pushover　analysis.　Subsequently,　the　IDA　method　is　employed　to　generate　time-dependent　seismic　fragility　curves　and　surfaces　specific　to　subway　station　structures.　The　numerical　results　indicate　that　the　impact　of　chloride-induced　corrosion　on　the　subway　station　structure　cannot　be　ignored.　In　the　corrosion　environment,　the　seismic　performance　assessment　of　subway　station　structures　must　take　into　account　time-dependent　damage　states　resulting　from　the　degradation　of　material　properties　and　the　reduction　in　seismic　capacity.　The　probability　of　a　subway　station　structure　exceeding　various　damage　states　monotonically　increases　during　its　service　life.　The　subway　station　structure　primarily　suffers　minor　to　moderate　damage　under　the　ground　motion　with　a　return　period　of　2450　or　10000　years,　as　it　reaches　its　design　service　life.