To　study　the　flexural　behavior　of　post-tensioned　prestressed　ultra-high　performance　steel　fiber　concrete　(UHPSFC)　beams,　six　post-tensioned　UHPSFC　beams　with　the　variables　being　the　passive　reinforcement　type,　reinforcement　ratio,　tension　control　stress　and　prestressing　degree　were　tested.　The　mechanical　properties　including　cracking　moment,　ultimate　moment,　failure　mode　and　cracks　were　studied　by　the　three　symmetrical　point　loading　tests.　The　results　show　that　HRB500　can　work　well　with　UHPSFC,　where　high　strength　can　be　fully　used.　The　cracking　moments　increase　with　the　increases　of　tension　control　stress　and　prestressing　degree.　The　bending　cracks　are　fine　and　closely　spaced,　and　the　maximum　of　crack　width　is　less　than　0.15　mm　at　serviceability　limit　state.　The　calculated　cracking　moment　values　agree　well　with　the　experimental　values　when　the　plastic　coefficient　is　revised　by　introducing　the　anti-cracking　coefficient.　The　ultimate　bearing　capacity　formula　is　established　based　on　the　simplified　stress-strain　law　of　UHPSFC,　and　the　results　of　the　formula　are　compared　with　test　data　and　show　a　good　correlation,　which　can　be　used　for　flexural　theoretical　analysis　and　design　for　UHPSFC　beams.　©,　2014,　Science　Press.　All　right　reserved.