To　investigate　the　confining　mechanism　of　concrete　columns　confined　by　CFRP-PVC　tubes,　a　finite　element　model　was　developed　by　the　software　packet　ABAQUS.　Numerical　calculation　was　carried　out　for　several　stubs　under　various　eccentricity　ratios　and　a　good　agreement　is　obtained　between　the　analytical　values　and　the　experimental　results.　Based　on　the　numerical　model,　the　force-deformation　process　of　the　concrete　columns　confined　by　CFRP-PVC　tubes　under　eccentric　loads　were　analyzed,　and　the　comparative　member　without　CFRP　wrapped　outside　was　analyzed　simultaneously.　Finally,　the　confining　mechanism　of　this　type　of　composite　member　was　put　forward.　The　results　show　that　the　developed　numerical　model　is　effective　in　simulating　analysis　and　reflecting　the　confining　mechanism.