Shear　tests　were　conducted　on　9　ultra-high　performance　fiber　reinforced　concrete　beams,　in　which　shear　span-to-depth　ratio,　stirrup　ratio　and　level　of　prestress　were　chosen　as　analysis　parameters.　From　the　results　of　diagonal　cracking　characteristics,　it　is　observed　that　with　the　increase　of　shear　span-to-depth　ratio,　the　failure　modes　transfer　from　diagonal　compression　failure　to　shear-compression,　then　to　diagonal　tension　failure.　However,　the　shear　strength　decreases　with　the　shear　span-to-depth　ratio.　The　shear　strength　increases　with　the　stirrup　ratio　and　the　strength　of　HRB500　stirrups　can　be　fully　used.　Prestress　can　significantly　improve　the　shear　strength.　Maximum　diagonal　crack　width　is　less　than　0.2　mm　in　serviceability　limit　states.　Before　the　critical　diagonal　crack　forms,　development　of　diagonal　cracks　width　is　slow,　but　after　that　crack　propagation　rate　increases　significantly.　The　shear　strength　results　of　ultra-high　performance　fiber　reinforced　concrete　beams　by　the　existing　code　are　too　conservative.　Based　on　the　shear　span-to-depth　ratio,　stirrup　ratio　and　prestress,　a　shear　strength　computation　formula　is　proposed.　The　analysis　results　of　17　beams　by　the　presented　method　agree　well　with　the　test　values,　and　the　variation　coefficient　is　small.