This　paper　conducted　an　experimental　study　on　the　behavior　of　six　circular　reinforced　concrete　columns　confined　by　FRP-PVC　tubes　under　reversed　loading.　The　design　parameters　included　the　axial　force　ratio,　the　number　of　layers　of　FRP　and　the　type　of　FRP.　The　effects　of　design　parameters　on　the　seismic　behavior,　such　as　failure　modes,　hysteretic　characteristics,　ductility,　energy　dissipation　ability,　strength　degradation,　and　stiffness　degradation,　were　the　emphasis　of　the　investigation.　The　experimental　results　indicate　that　when　the　outer　FRP-PVC　tubes　fracture　or　fail,　the　lateral　bearing　capacity　will　suddenly　drop,　and　the　members　will　be　degraded　to　reinforced　concrete　ones,　thus　the　fracture　and　failure　of　FRP-PVC　tubes　is　regarded　as　the　first　alarming　before　failure　of　the　specimens.　Mid-span　load-deflection　hysteretic　curves　exhibit　good　hysteretic　behaviors,　and　the　strength　degradation　is　not　apparent　for　all　specimens.　The　lateral　peak　load　increases　as　the　axial　load　ratio　grows,　while　the　stiffness　degradation　delays　and　the　energy　dissipation　decreases.　The　specimen　confined　by　CFRP　shows　higher　lateral　peak　load,　lower　stiffness　degradation　and　better　energy　dissipation　capacity,　compared　with　the　specimen　confined　by　BFRP.　The　ductility　is　improved　as　the　number　of　layers　of　BFRP　increase,　while　the　stiffness　degradation　delays　for　all　specimens.