To　overcome　the　shortages　of　current　laminated　rubber　bearings　(RB),　a　new　kind　of　isolator　called　Prestressed　Rubber　Bearing　(PRB)　is　presented　in　this　paper,　which　is　invented　by　appropriately　amplifying　the　thickness　of　rubber　layers　in　conventional　RB　and　employing　prestress　tendons.　Based　on　the　experimental　study,　a　modified　formula　for　vertical　stiffness　of　PRB　is　established.　Then　the　nonlinear　analytical　model　for　PRB＇s　horizontal　stiffness　is　developed　and　the　corresponding　formulas　are　derived.　Through　the　response　history　analysis　of　structures,　the　isolation　capacities　of　PRBs　are　investigated.　The　results　show　that　the　horizontal　stiffness　of　PRB　is　variable　with　the　displacment.　PRB　not　only　has　effective　isolation　capacity　as　conventional　RBs　but　also　has　the　favorable　capacity　of　horizontal　displacement　limitation　and　vertical　up　resistance.　©　VIBROENGINEERING.　JOURNAL　OF　VIBROENGINEERINO.　MARCH　2013.