Based　on　low　reversed　cyclic　loading　experiments　of　8　concrete　beams,　failure　pattern,　hysteresis　curve,　ductility,　rigidity　degeneration,　energy　dissipation　were　systematically　studied.　The　effects　of　prestressing　tendon　type　and　prestressing　ratio　(PPR)　on　seismic　performance　were　investigated.　Studies　show　that　the　prestressing　ratio　is　the　main　factor　to　affect　the　seismic　performance　of　prestressed　beams,　which　gradually　decreased　with　the　increase　of　prestessing　ratio.　If　the　prestressing　ratio　remained　the　same,　the　energy　dissipation　capacity　of　unbonded　prestressed　concrete　beams　was　better　than　bonded　prestressed　beams.　With　combined　bonded　and　unbonded　prestressed　FRP　tendons,　the　ductility　ratio　of　the　beams　was　increased　by　12%　and　26%,　respectively,　as　compared　with　the　ductility　ratio　of　bonded　and　unbonded　prestressed　beams,　and　the　hysteretic　curve　became　more　plump.　Finite　element　analysis　was　conducted　using　nonlinear　material　model,　and　the　results　were　close　to　the　test　data.