To　study　the　fracture　behavior　of　hybrid　fiber　reinforced　ultra-high　performance　concrete　(UHPC),　three-point　bending　fracture　tests　were　carried　out　on　UHPC　beams　with　pre-cracks.　Steel　fibers　were　mixed　with　six　kinds　of　non-metallic　fibers　to　study　the　effects　of　different　kinds　of　hybrid　fibers　on　the　fracture　behavior.　The　volume　fraction　of　steel　fiber　was　1.　3%,　and　the　volume　fraction　of　mixing　synthetic　fiber　or　inorganic　fiber　was　0.　5%　.　The　load-crack　mouth　opening　displacement　(P-D)　curves　were　measured.　The　initial　toughness,　instable　toughness,　fracture　energy　and　fracture　characteristic　parameters　were　analyzed.　The　bending　strength　and　residual　strength　were　studied.　Results　show　that　the　P-D　curves　measured　by　UHPC　have　obvious　secondary　hardening　characteristics,　and　the　steel　fiber　and　other　non-metallic　fibers　have　certain　coordination　crack　resistance　and　control　capability.　The　deformation　ability　of　notched　beams　after　cracking　is　improved　by　mixing　synthetic　or　inorganic　fiber.　Mixing　polyolefin　fiber　with　diameter　of　0.　15　mm　increases　the　fracture　energy.　The　fracture　resistance　of　UHPC　can　be　improved　by　mixing　PVA　fiber　with　diameter　of　0.　04　mm.　Mixing　glass　fiber　can　improve　the　fracture　properties　of　UHPC,　and　its　length　should　not　exceed　12　mm.　The　diameter　of　polyester　fiber　should　not　exceed　0.　75　mm.　The　non-metallic　fibers　with　higher　elastic　modulus　can　improve　the　fracture　resistance　of　UHPC.　©　2023　Beijing　University　of　Technology.　All　rights　reserved.