12　specimens　were　prepared　to　investigate　the　shear　performance　of　Hybrid　Fiber　Reinforced　Reactive　Powder　Concrete　(HFRPC)　beams.　Variation　parameters　include:　the　shear　span　ratio,　reinforcement　ratio,　stirrup　strength,　stirrup　placement　angle　and　fiber　volume.　The　test　results　show　that:　hybrid　fibers　can　significantly　improve　the　RPC　beam＇s　shear　deformation　capacity,　turning　beam　shear　failure　mode　from　brittle　shear　failure　to　ductile　failure.　Macro　polyolefin　fibers　can　effectively　inhibit　extension　of　critical　diagonal　cracks,　slow　down　the　decrease　rate　of　post-peak　bearing　capacity,　increase　the　number　of　diagonal　cracks,　and　reduce　crack　width.　When　the　shear　span　to　effective　section　height　ratio　was　3.5,　the　beams　mainly　exhibited　diagonal　tension　shear　failure.　When　shear　span　ratio　increased,　the　bearing　capacity　decreased,　and　the　high-strength　stirrups　yielded.　When　stirrup　ratio　was　increased　from　0.42%　to　0.64%,　and　the　shear　span　ratio　was　1.5,　2.5　and　3.5,　the　shear　capacity　increased　by　22.1%,　7.1%　and　8.1%　respectively.　Further　increasing　stirrup　ratio　for　beams　with　shear　compression　failure　had　little　effect　on　the　bearing　capacity.　When　steel　fiber　volume　fraction　was　increased　from　1%　to　2%,　the　shear　capacity　was　augmented　by　about　17%.　Existing　codes　for　the　calculation　of　shear　capacity　of　beams　give　too　conservative　values.　Calculated　value　obtained　using　the　French　specifications　for　RPC　shear　formula　is　not　safe　for　diagonal　tension　failure　beams,　and　coefficient　of　variation　is　large.　This　paper　puts　forward　the　concept　of　shear　toughness　index　to　characterize　HFRPC　beam　shear　deformation　capacity　and　toughness.　The　classical　plasticity　theory　is　for　the　first　time　modified　by　introducing　plastic　shear　coefficient　into　the　bearing　capacity　formula,　taking　into　account　the　influence　of　fiber　crack　resistance,　bridging　effect　and　shear　span　ratio　on　the　shear　capacity　and　diagonal　cracks　propagation.　The　theoretical　calculation　results　agree　well　with　the　test　results.　©,　2015,　Editorial　Office　of　China　Civil　Engineering　Journal.　All　right　reserved.