The　connection　between　subway　stations　and　tunnels　in　subway　systems　is　a　critical　consideration　in　the　design　of　underground　transportation　systems.　Expansion　joints　may　be　introduced　between　the　station　and　tunnel　to　reduce　the　stress　and　deformation　transmitted　to　the　structure　and　mitigate　the　potential　structural　damage.　However,　adverse　conditions　such　as　large　deformations　in　liquefiable　sites　and　extreme　earthquakes　can　severely　impact　the　integrity　of　this　connection.　This　study　employs　three-dimensional　finite　element　numerical　models　of　dynamic　soil-structure　interaction　in　liquefiable　sites　to　investigate　the　seismic　response　of　the　subway　station-tunnel　connection　section　structure　under　different　distributions　of　liquefied　soil　layers　and　considering　various　structural　connection　methods.　The　results　demonstrated　that　subway　station-tunnel　structure　placed　in　liquefied　interlayer　sites　experiences　greater　seismic　damage　compared　to　structures　with　their　upper　parts　embedded　in　homogeneous　liquefiable　sites.　In　addition,　using　expansion　joints　between　the　station　and　tunnel　can　indeed　reduce　the　seismic　stresses　and　deformations　transmitted　to　the　structure,　which　can　mitigate　the　extent　and　severity　of　its　damage.　However,　the　expansion　joint　can　lead　to　misalignment　between　the　subway　station　and　the　tunnel.　The　findings　provide　theoretical　references　for　seismic　design　and　disaster　mitigation　measures　for　subway　structures　in　liquefiable　sites.　©　2025　Elsevier　Ltd