Total　of　16　CFST　dumbbell　shaped　columns　subjected　to　eccentric　loads　were　tested　with　variation　of　slenderness　ratio　and　eccentricity　ratio.　The　test　procedure　and　the　failure　modes　of　specimens　are　introduced,　and　the　load-deflection　curves,　ultimate　load-carrying　capacity　are　obtained.　Test　results　indicate　that　the　specimens　fail　in　global　buckling,　and　their　ultimate　load-carrying　capacities　and　the　tangential　stiffness　in　elastic-plastic　phase　decrease　with　the　increase　of　the　slenderness　ratio　and　the　eccentricity　ratio.　Furthermore,　finite　element　models　are　established　to　analyze　the　behavior　of　CFST　dumbbell　shaped　long　columns　under　eccentric　loads,　showing　that　the　effect　of　slenderness　ratio　to　load-carrying　capacity　and　that　of　eccentricity　ratio　are　independent,　so　their　total　effect　can　be　accounted　by　a　multiplication　of　individual　effect.　The　calculation　of　stability　coefficient　is　identical　to　that　of　long　axial　columns.　The　eccentric　reduction　coefficient　can　be　predicted　by　the　proposed　formula　from　regression　analysis　of　both　experimental　and　computational　results.