The　applying　of　the　high-strength　steel　bars　to　the　ultra-high　performance　concrete　(UHPC)　structure　can　bring　the　advantages　of　the　high　strength　of　the　steel　bars　and　the　UHPC　into　full　play.　To　have　an　understanding　of　the　influences　of　the　prestressing　degrees　and　steel　bar　ratios　on　the　seismic　behavior　of　the　UHPC　beams　reinforced　with　the　prestressing　high-strength　steel　bars,　3　prestressed　and　1　non-prestressed　UHPC　beams　were　designed　and　cast　and　the　low-cycle　repeated　load　tests　for　the　beams　were　made.　The　seismic　failure　modes,　hysteretic　curves,　skeleton　curves,　ductility　indices,　rigidity　degradation　and　the　energy　dissipation　and　deformation　recovery　capacity　of　the　different　beams　were　analyzed　and　the　laws　of　the　influences　of　the　prestressing　degrees　and　the　conversed　steel　bar　ratios　on　the　seismic　behavior　of　the　beams　were　studied.　The　results　indicate　that　the　UHPC　beams　that　are　non-prestressed　and　that　have　the　medium　prestressing　degrees　have　good　seismic　and　ductility　behavior　while　the　beams　that　have　the　high　prestressing　degrees　have　good　crack-resistant　and　deformation　recovery　capacity.　The　increase　of　the　prestressing　degrees　can　decrease　the　energy　dissipation　capacity　of　the　beams　and　improve　the　deformation　recovery　capacity,　but　has　little　influence　on　the　rigid　degradation　rates.　The　increase　of　the　conversed　steel　bar　ratios　can　retard　the　rigidity　degradation　rates　of　the　beams　and　decrease　the　energy　dissipation　capacity,　but　has　little　influence　on　the　deformation　recovery　capacity.　©　2016,　Journal　Press,　China　Railway　Bridge　Science.　All　right　reserved.