The　axial　compression　constitutive　model　of　confined　ultra-high　performance　concrete　(UHPC)　is　the　basis　of　structural　design　and　nonlinear　analysis　of　UHPC　columns.　The　axial　compression　test　of　nine　UHPC　columns　confined　by　stirrups　were　performed　in　this　study.　The　high-strength　stirrups　showed　advantages　in　improving　the　strength　and　deformation　performance　of　confined　UHPC　over　normal　stirrups,　and　better　compatibility　with　UHPC　than　normal　stirrups.　The　confined　UHPC　columns　with　high　volume　stirrup　ratio,　closely　spaced,　high-strength　and　complex　ties　configuration　may　lead　to　a　smooth　stress-strain　curve,　and　significantly　improves　the　strength　and　deformation　performance　of　confined　UHPC.　The　high-strength　stirrups　may　not　yield　completely　at　the　peak　strength,　indicating　that　using　the　yield　strength　of　stirrups　to　calculate　the　confining　pressure　at　the　peak　may　overestimate　the　peak　strength　of　confined　UHPC.　The　formula　of　peak　strain　and　high-strength　stirrup　stress　at　the　peak　point,　and　the　formula　of　peak　stress　based　on　the　Ottosen＇s　failure　criterion　were　drawn　for　confined　UHPC.　A　new　confined　UHPC　constitutive　model　was　presented.　Compared　with　other　typical　models,　the　new　model　agreed　with　the　test　curve.　©　2020,　Engineering　Mechanics　Press.　All　right　reserved.