This　study　presents　an　experimental　study　on　the　shear　behaviors　of　fourteen　ultra-high　performance　concrete　(UHPC)　deep　beams.　The　effects　of　different　parameters,　including　shear　span　to　effective　depth　ratio　A,　concrete　strength　s,　steel　fiber　volume　fraction　(UHPC　strength)　Vf,　longitudinal　reinforcement　ratio　ps,　horizontal　and　vertical　web　reinforcement　ratio　(psh　and　psv),　were　considered.　The　other　two　deep　beams　of　normal　strength　concrete　(NSC)　and　high　strength　concrete　(HSC)　were　also　tested　for　comparison.　Experiment　results　indicate　that　the　shear　strength　of　the　UHPC　specimens　increased　with　the　concrete　strength,　longitudinal　reinforcement　ratio,　stirrup　ratio,　and　horizontal　web　reinforcement　ratio,　and　decreased　with　increasing　ratio　of　shear　span　to　effective　depth.　The　UHPC　specimens　are　ideally　reinforced,　while　NSC　and　HSC　specimens　are　over-reinforced,　therefore,　the　strength　of　longitudinal　reinforcement　is　easier　to　be　fully　utilized　in　the　former　than　that　in　the　latter.　Both　＂beam　action　＂　and　＂arch　action　＂　coexisted　in　the　UHPC　deep　beams.　Before　the　applied　load　reached　50%~70%　of　the　ultimate　load,　the　UHPC　deep　beams　were　dominated　by　the　＂beam　action　＂;　after　that,　they　were　dominated　by　the　＂arch　action　＂.　All　deep　beam　specimens　failed　in　shear,　13　UHPC　specimens　failed　in　shear　compression,　one　UHPC　with　a　lower　shear　span　to　effective　depth　ratio　(A　=　0.554)　as　well　as　NSC　and　HSC　specimens　failed　in　diagonal　compression,　which　indicated　that　the　failure　modes　were　affected　by　the　ratio　of　shear　span　to　effective　depth　A　and　the　concrete　strengths.　For　the　shear　strength　of　the　UHPC　deep　beams,　0.739　is　the　threshold　value　of　A.　When　A　is　greater　than　it,　the　shear　strength　decreases　with　the　increase　of　A,　while　when　A　is　less　than　that,　the　shear　strength　approximately　remains　constant.