In　general,　only　one　fixed　pier　is　set　for　a　railway　continuous　bridge.　The　aseismic　capacity　of　the　fixed　pier　is　difficult　to　satisfy　the　demand　in　strong　earthquake　area.　To　solve　this　problem,　an　innovative　shock　isolation　design　with　a　self-centering　structure　at　the　fixed　pier　bottom　of　continuous　bridge　was　put　forward.　Under　normal　conditions,　the　fixed　pier　bottom　is　in　a　fixed　state　with　the　cushion　cap.　In　the　case　of　rare　earthquake,　the　relative　swing　between　the　bottom　of　the　fixed　pier　and　the　base　platform　reduces　the　seismic　energy　transmission　to　the　bridge　superstructure,　and　at　the　same　time　the　mutual　friction　during　the　swing　process　can　dissipate　some　seismic　energy.　At　the　end　of　earthquake,　the　superstructure　can　automatically　return　to　the　initial　position　under　the　action　of　earthquake　residual　energy　and　self　weight.　A　case　study　of　a　typical　3-span　railway　continuous　bridge　was　performed　to　study　the　shock　isolation　mechanism　of　self-centering　structure　of　the　pier　bottom　and　to　analyze　the　influence　of　the　main　parameters　of　the　pier　bottom　self-centering　structure　on　shock　isolation　effect　and　hysteretic　behavior.　The　results　show　that　installation　of　the　self-centering　shock　isolation　structure　at　fixed　pier　bottom　can　effectively　reduce　the　internal　force　response　of　the　fixed　pier,　resulting　in　perfect　shock　isolation　effect.　But　it　may　increase　the　longitudinal　displacement　response　of　the　beam　end　when　the　piers　are　too　short,　which　should　be　considered　in　aseismic　design.　The　ellipse　major　radius　a,　minor　radius　b　and　pier　height　H　have　great　influence　on　shock　isolation　effect,　while　the　friction　coefficient　μ　has　little　impact　on　the　effect.　The　ratio　of　long　radius　and　short　radius　a/b　has　a　great　influence　on　the　hysteretic　behavior　of　the　pier　bottom　self-centering　shock　isolation　structure.　©　2018,　Department　of　Journal　of　the　China　Railway　Society.　All　right　reserved.