A　unseating-prevention　laminated　rubber　bearing　(URB)　was　developed　to　solve　the　problem　that　girder　falling　might　be　caused　by　the　failure　of　laminated　rubber　bearing　(RB).　Based　on　introduction　of　URB,　seismic　analysis　of　a　typical　precast　bridge　with　URB　in　the　high-intensity　seismic　zone　under　rare　earthquake　was　done　and　parameters　of　URB　were　studied　afterwards.　Results　show　that　relative　displacement　between　the　superstructure　and　the　substructure　of　the　bridge　can　be　controlled　by　wire　rope　of　URB　to　protect　the　bearings　and　reduce　the　risk　of　girder　falling;　although　seismic　response　of　pier　can　be　increased　by　URB,　this　adverse　effects　can　still　be　reduced　by　adjusting　parameters　of　the　wire　rope;　initial　gap　and　tensile　stiffness　of　the　wire　rope　are　basic　parameters　of　URB,　where　the　former　should　meet　the　demands　of　normal　using　and　earthquake,　and　the　later　can　be　determined　by　considering　seismic　response　of　URB　and　the　pier　together.