In　order　to　evaluate　the　seismic　isolation　performance　of　a　new　type　of　C-shaped　steel　damping　slide　bearing　effectively,　the　vulnerability　of　the　bearing　was　analyzed　on　the　basis　of　the　shaking　table　test　of　the　two-span　continuous　beam　bridge.　Firstly,　the　basic　situation　of　the　shaking　table　test　was　introduced.　The　calculation　model　of　the　two-span　continuous　girder　bridge　was　established　using　the　spring　element　to　simulate　the　seismic　isolation　bearing.　Secondly,　according　to　the　relationship　between　bearing　displacement　and　failure,　the　judgment　criteria　of　different　damage　states　of　steel　damping　slide　bearing　were　established　and　the　seismic　damage　probabilistic　demand　model　and　the　PGA　probabilistic　demand　model　of　steel　damping　slide　bearing　were　obtained.　Finally,　the　probabilistic　damage　model　of　steel　damping　slide　bearing　was　established,　and　the　seismic　performance　of　the　bridge　with　steel　damper　slide　bearing　was　evaluated　by　using　the　vulnerability　curves.　The　results　show　the　high　accuracy　of　the　probabilistic　demand　model　with　the　error　between　the　measured　and　calculated　bearing　displacement　being　less　than　15%.　The　probability　based　vulnerability　method　can　effectively　evaluate　the　seismic　isolation　performance　of　the　steel　damper　slide　bearing,　and　the　probability　of　medium　damage　of　steel　damping　sliding　bearing　is　less　than　10%　under　design　seismic　action.　Under　rare　earthquake,　the　probability　of　the　serious　and　complete　failure　of　steel　damping　sliding　bearing　is　less　than　20%　and　5%,　respectively.　Under　the　same　ground　motion　intensity,　the　damage　probability　of　the　steel　damper　slide　bearing　in　longitudinal　direction　is　greater　than　that　of　transverse　direction.　©　2021,　Department　of　Journal　of　the　China　Railway　Society.　All　right　reserved.