The　spherical　surface　of　the　friction　pendulum　system　(FPS)　inevitably　introduce　a　constant　dominant　period,　which　may　lead　to　resonance　problem　when　subjected　to　the　ground　motions　with　long-period　components.　In　this　study,　a　multiple-variable　frequency　pendulum　isolator　(MVFPI)　was　developed　to　overcome　this　limitation.　The　sliding　surface　of　the　MVFPI　was　predefined　as　a　continuous　piecewise　function　to　combine　the　seismic　performance　of　MVFPI　with　different　seismic　intensities.　The　high-performance　materials,　polytetrafluoroethylene　(PTFE)　fabric　and　shape　memory　alloy　(SMA)　were　utilized　to　improve　its　durability　and　control　the　deformation.　Based　on　the　underlying　principles　of　operation,　the　force-displacement　relationships　of　the　MVFPI　were　derived.　A　series　of　tests　of　high-performance　materials　and　MVFPI　were　conducted　to　verify　the　accuracy　of　the　derived　hysteresis　model.　Parametric　studies　and　optimal　analysis　were　carried　out　on　the　critical　parameters　of　the　MVFPI.　The　results　indicate　that　the　MVFPI　has　the　desired　hysteretic　behavior　as　prescribed　by　the　derived　formulas.　Moreover,　the　seismic　responses　of　the　structure　isolated　by　MVFPI　with　optimal　parameters　could　be　controlled　within　the　desired　range.