This　study　aims　to　understand　the　shear　performance　of　reinforced　ultra-high　performance　concrete　(R-UHPC)　short　beams　and　to　propose　a　calculation　method　for　their　shear　capacity.　A　total　of　11　R-UHPC　short　beam　specimens　were　tested　to　investigate　the　effects　of　key　parameters　on　the　shear　capacity,　including　steel　fiber　volume　fraction,　longitudinal　reinforcement　ratio,　stirrup　ratio,　and　shear　span-to-depth　ratio.　Experimental　results　indicated　that　the　shear　capacity　increased　with　the　increase　of　steel　fiber　volume　fraction,　longitudinal　reinforcement　ratio,　and　stirrup　ratio,　while　it　decreased　with　the　increase　of　shear　span-to-depth　ratio.　Results　also　showed　that　for　R-UHPC　beams,　the　effect　of　shear　span-to-depth　ratio　can　only　be　ignored　for　a　ratio　less　than　1.2　rather　than　1.5　that　is　required　for　reinforced　concrete　(RC)　beams　by　the　Chinese　design　code.　Moreover,　it　was　found　that　the　calculation　methods　for　the　shear　capacity　of　R-UHPC　beams　in　the　current　codes　underestimated　the　shear　capacity　of　the　specimens　by　30　%　similar　to　50　%,　as　these　methods　did　not　consider　the　aforementioned　significant　parameters.　A　calculation　method　was　proposed　based　on　the　modified　compression　field　theory　(MCFT)　to　comprehensively　consider　all　the　aforementioned　parameters.　The　proposed　method　exhibited　a　higher　accuracy　and　less　dispersion　as　compared　to　the　methods　specified　by　current　codes.