In　order　to　investigate　the　axial　compression　behaviors　of　FRP　(fiber-reinforced　polymer)　confined　UHPC　(ultra-high　performance　concrete)　specimens　under　axial　compression,　30　FRP　confined　UHPC　specimens　and　3　unconfined　UHPC　cylindrical　specimens　were　tested.　The　effects　of　FRP　types,　layers　of　fiber　sheets,　and　confinement　methods　(FRP　tube　or　FRP　sheet)　on　the　compression　behaviors　of　confined　UHPC　were　analyzed.　Based　the　test　results　and　considering　the　confinement　ratio　and　lateral　restraint　stiffness,　new　models　for　predicting　the　compressive　strength　and　ultimate　strain　were　proposed.　In　addition,　the　Lam-Teng　model　was　improved　by　revising　its　a　parameter.　The　research　results　indicate　that　confinement　ratio　and　lateral　restraint　stiffness　are　the　major　influencing　factors　of　the　compressive　strength　and　ultimate　strain　of　confined　UHPC,　and　the　stress-strain　curve　of　a　confined　specimen　is　consisted　of　a　parabola　and　a　straight　line　segment.　The　improved　Lam-Teng　model　has　a　goodness　of　fit　of　0.96,　so　it　can　predict　the　stress-strain　relationship　of　confined　specimens　more　accurately.　©,　2015,　Xinan　Jiaotong　Daxue　Xuebao/Journal　of　Southwest　Jiaotong　University.　All　right　reserved.