In　order　to　investigate　the　effects　of　the　eccentricity　and　slenderness　ratio　on　the　behaviors　of　concrete-filled　double-skin　steel　tubular　columns　with　the　outer　stiffened　thin-walled　steel　tube,　the　tests　of　five　slender　concrete-filled　double-skin　thin-walled　steel　tubular　(CFDSTST)　columns　with　outer　square　hollow　section　and　inner　circular　hollow　section　under　the　eccentric　compression　were　carried　out.　The　test　results　indicate　that　the　load-carrying　capacity　decreases　with　the　increase　of　the　eccentricity　and　slenderness　ratio.　The　ductility　of　this　composite　column　is　lower　than　traditional　CFDST　columns.　The　finite　element　(FE)　simulation　of　CFDTST　columns　under　eccentric　compression　was　performed.　The　FE　predictions　agreed　well　with　the　test　results.　Based　on　the　FE　model,　the　mechanical　and　parametric　analyses　were　carried　out.　The　mechanical　analysis　indicates　that　the　confinement　of　the　outer　steel　tube　is　focused　on　a　small　region　at　the　corner　of　the　cross-section.　And　the　most　of　the　loading　is　carried　by　the　core　concrete.　The　parametric　analysis　indicates　that　the　shape　of　the　axial　compression　versus　moment　interaction　curve　is　directly　affected　by　the　concrete　strength,　steel　yield　strength,　diameter　to　thickness　ratio,　diameter　to　width　ratio　or　slenderness　ratio.　A　simplified　calculation　method　was　proposed　to　predict　the　load-carrying　capacities　of　CFDTST　columns　under　eccentric　compression,　and　it　is　useful　for　real　project.　©　2018,　Editorial　Office　of　Journal　of　Building　Structures.　All　right　reserved.