A　lot　of　test　data　of　shear　bearing　capacity　concerning　reinforced　ultra-high　performance　concrete(R-UHPC)　beams　were　collected,　existing　calculation　methods　of　shear　bearing　capacity　were　analyzed,　and　the　shear　bearing　mechanism　of　R-UHPC　beam　was　studied.　The　tensile　strength　of　UHPC　was　considered,　a　calculation　method　of　shear　bearing　capacity　for　R-UHPC　beam　based　on　truss-arch　model　was　presented,　and　the　calculated　result　and　test　result　of　shear　bearing　capacity　were　compared.　Comparison　result　indicates　that　in　the　calculation　methods　at　present,　based　on　statistical　analysis　method,　the　average　ratio　of　the　calculation　values　to　the　test　values　of　shear　bearing　capacity　is　0.92,　its　standard　deviation,　correlation　coefficient　and　reliability　coefficient　are　0.23,　0.78　and　0.877,　respectively,　and　the　computation　accuracy　is　not　high　due　to　the　limitation　of　regression　data.　For　the　calculation　methods　based　on　the　general　truss　model,　the　average　ratio　of　the　calculation　values　to　the　test　values　of　shear　bearing　capacity　with　AFGC　in　French　UHPC　is　0.90,　its　standard　deviation,　correlation　coefficient　and　reliability　coefficient　are　0.18,　0.80　and　0.891,　respectively,　and　the　computation　accuracy　is　higher　than　the　accuracies　of　Japan　UHPC＇s　JSCE　and　Swiss　SIA.　When　the　effect　of　longitudinal　reinforcement　is　considered　based　on　AFGC,　the　average　ratio　of　the　calculation　values　to　the　test　values　of　shear　bearing　capacity　is　0.93,　its　standard　deviation,　correlation　coefficient　and　reliability　coefficient　are　0.23,　0.75　and　0.858,　respectively,　and　the　result　has　larger　discreteness　than　the　result　of　AFGC.　For　the　calculation　methods　based　on　the　truss-arch　model,　the　average　ratio　of　the　calculation　values　to　the　test　values　of　shear　bearing　capacity　is　0.76,　and　its　standard　deviation,　correlation　coefficient　and　reliability　coefficient　are　0.26,　0.62　and　0.768,　respectively.　Because　the　computation　methods　of　shear　bearing　capacity　of　reinforced　(common)　concrete　beam　are　straightly　applied　and　the　tensile　strength　of　UHPC　is　neglected,　the　result　is　conservative　and　most　unreliable.　For　the　proposed　calculation　method　of　shear　bearing　capacity,　the　average　ratio　of　the　calculation　values　to　the　test　values　of　shear　bearing　capacity　is　0.94,　and　its　standard　deviation,　correlation　coefficient　and　reliability　coefficient　are　0.21,　0.80　and　0.885,　respectively.　Compared　with　the　calculation　methods　at　present,　the　proposed　method　has　higher　precision　and　less　discreteness.　©　2017,　Editorial　Department　of　Journal　of　Traffic　and　Transportation　Engineering.　All　right　reserved.