To　investigate　the　seismic　performance　of　FRP　strengthened　RC　hollow　section　bridge　piers　under　multi-dimensional　earthquake　excitation,　the　pseudo-static　test　was　carried　out　to　RC　rectangular　hollow　section　as-built　and　CFRP　confined　bridge　piers　under　constant　axial　compression　force　and　bidirectional　horizontal　repeated　load.　The　failure　characteristics,　lateral　force-deformation　curves　and　ductility　of　specimens　were　analyzed.　The　experimental　result　shows　that　CFRP　constraining　may　change　the　failure　mode　of　hollow　section　bridge　piers,　and　significantly　improve　the　deformation　ductility,　plastic　deformation,　however,　it　is　less　contribution　to　horizontal　force　of　specimens　with　less　wall-thickness.