The　mechanical　behavior　and　stress　mechanism　of　glass　fiber　reinforced　plastic(GFRP)-reinforced　sea　sand　concrete-filled　steel　reinforced　polyethylene(SRPE)tubular　columns　were　studied　by　experiment　and　numerical　simulation.　Through　24　axial　compression　short　column　tests,　the　effects　of　SRPE　pipe　steel　wire　volume　stirrup　ratio,　concrete　strength　and　GFRP　stirrup　spacing　on　the　mechanical　behavior　of　the　composite　columns　were　studied.　Based　on　the　reasonable　determination　of　the　material　constitutive　model,　ABAQUS　finite　element　software　was　used　for　numerical　simulation　and　parameter　analysis.　The　results　show　that　although　the　composite　column　fails　in　shear　mode,　it　still　has　good　ductility　in　the　range　of　test　parameters,　which　proves　that　the　SRPE　pipe　and　GFRP　stirrup　have　a　good　confinement　on　the　sea　sand　concrete.　Finite　element　numerical　parametric　analysis　shows　that　increasing　the　volume　stirrup　ratio　of　hoop　steel　wire　can　significantly　improve　the　peak　bearing　capacity,　residual　bearing　capacity　and　ductility.　Increasing　the　strength　of　concrete　can　significantly　improve　the　peak　bearing　capacity,　residual　bearing　capacity　and　elastic　stiffness,　but　the　ductility　is　obviously　reduced.　The　influence　of　other　parameters　on　the　mechanical　behavior　of　composite　columns　is　not　significant.　Based　on　the　results　of　parameter　analysis,　the　simplified　calculation　formulas　of　axial　compression　bearing　capacity　and　ultimate　strain　of　composite　columns　are　proposed,　which　can　provide　reference　for　similar　engineering　practice.　©　2025,　Editorial　Department　of　Journal　of　Architecture　and　Civil　Engineering.　All　rights　reserved.