Tests　on　the　deformation　behavior　of　two　concrete-filled　double　skin　(CHS　inner　and　CHS　outer)　steel　tubular　columns　subjected　to　long-term　sustained　loads　are　performed.　Based　on　the　creep　and　shrinkage　model　of　the　concrete　under　sustained　loads　proposed　in　ACT　209　(1992),　the　calculations　of　the　deformation　of　concrete-filled　double　skin　steel　tubular　columns　are　presented.　The　calculated　results　show　good　agreement　with　the　test　ones.　Influences　of　several　parameters,　such　as　loading　age(τ0),　sustained　time　(T),　nominal　steel　ratio　(αn),　sustained　loads　level　(n),　steel　strength　(fyo,　fyi),　inner　steel　thickness　(ti),　concrete　strength　(fcu)　and　hollow　ratio　(χ)　on　the　shrinkage　and　creep　of　the　columns　are　analyzed.