Based　on　the　axial　compression　test　of　5　ultra-high　performance　concrete　(UHPC)　columns　confined　by　high-strength　stirrups　and　4　UHPC　columns　confined　by　normal-strength　stirrups,　the　bearing　capacity,　failure　mode,　steel　strain　and　stress-strain　curve　for　the　confined　UHPC　columns　were　studied,　and　the　influences　of　volume　stirrup　ratio,　strength,　spacing　and　configuration　of　stirrup　on　the　axial　compression　behavior　of　confined　UHPC　were　analyzed　by　combining　ductility　and　toughness　index.　The　results　show　that　all　the　specimens　have　ductility　damages,　and　the　damage　degree　of　UHPC　columns　confined　by　high-strength　stirrups　is　lighter.　The　confined　UHPC　columns　with　high　volume　stirrup　ratio,　closely　spaced,　high-strength　and　complex　ties　configuration　have　good　confinement　efficiency,　bearing　capacity　and　deformation　performance,　which　also　leads　to　an　ideal　axial　compression　behavior.　The　effect　of　volume　stirrup　ratio　on　the　axial　compression　behavior　of　specimens　is　greater　than　that　of　stirrup　strength.　Among　the　three　factors　affecting　the　volume　stirrup　ratio,　such　as　spacing,　configuration　and　diameter　of　stirrup,　the　stirrup　spacing　contributes　most　to　the　improvement　of　confinement　performance,　followed　by　the　configuration　and　diameter　of　stirrup.　The　UHPC　confined　by　high-strength　stirrups　presents　better　axial　compression　performance　and　residual　bearing　capacity　than　the　normal-stirrups.　The　micro-bending　of　the　longitudinal　bars　accelerates　the　cover　spalling,　while　the　high-strength　stirrups　with　close　space　effectively　delays　the　buckling　of　longitudinal　bars,　and　significantly　improves　the　overall　performance　of　the　confined　UHPC.　The　micro-bending　of　longitudinal　bars　weakens　the　confine　effect　of　the　high-strength　stirrups　on　the　core　UHPC,　and　the　combination　of　high-strength　longitudinal　bars　and　stirrups　is　suggested.　Based　on　the　test　data,　the　formulas　to　determine　the　bearing　capacity　of　UHPC　columns　confined　by　stirrups　are　drawn.　©　2020,　Editorial　Office　of　Acta　Materiae　Compositae　Sinica.　All　right　reserved.