Previous　seismic　analysis　of　subway　stations　typically　focused　on　analyzing　the　seismic　response　of　intact　structures.　However,　subway　station　structures　are　buried　underground　and　are　susceptible　to　chloride　ion　erosion.　This　can　result　in　the　degradation　of　material　performance.　This　paper　aims　to　establish　nonlinear　soil-structure　interaction　finite　element　models　for　subway　station　structures　with　different　degrees　of　corrosion　under　chloride　environments　at　coastal　areas.　The　static　pushover　analysis　method　was　utilized　to　investigate　the　influence　of　chloride　ion　erosion　on　the　soil-structure　flexibility　ratio.　Furthermore,　based　on　nonlinear　time　history　analysis,　the　seismic　response　of　subway　station　structure　in　coastal　chloride　environments　was　analyzed.　The　numerical　simulation　results　indicate　that　compared　to　the　intact　state,　the　soil-structure　flexibility　ratio　of　the　structures　with　10%　and　20%　corrosion　rates　decreases　by　6%　and　18%,　respectively.　However,　due　to　the　confinement　of　the　surrounding　soil,　the　maximum　inter-story　drift　angle　of　the　lower-level　columns　does　not　exhibit　significant　changes　under　the　same　motion.　As　the　vulnerable　component　in　seismic　resistance,　the　corrosion　of　reinforcement　in　the　lower-level　columns　leads　to　a　decrease　in　their　deformation　capacity　and　load-bearing　capacity.　This　results　in　a　reduction　of　the　safety　factor　of　subway　station　structures　by　approximately　10%　and　20%　.　The　increase　in　the　maximum　inter-story　drift　angle　of　corroded　columns　is　influenced　by　the　site　response.　Under　the　motion　with　a　rich　low-frequency　component,　the　significant　shear　deformations　of　the　soil　lead　to　a　situation　where　the　reinforcement　in　the　fiber　section　of　the　columns　bears　more　axial　force.　At　this　point,　the　corrosion　of　reinforcement　will　have　a　significant　impact　on　the　inter-story　drift　angle　of　the　columns.　©　2024　Harbin　Institute　of　Technology.　All　rights　reserved.