In　order　to　investigate　the　overall　buckling　behaviour　of　duplex　stainless　steel　columns　under　axial　compression,　the　axial　compression　tests　of　six　full-scale　welded　box-section　specimens　were　carried　out.　The　initial　geometric　imperfection　of　each　specimens　and　the　loading　eccentricity　were　measured　before　and　during　the　tests,　respectively.　Based　on　the　test　data,　the　overall　buckling　deformation　characteristics　and　the　buckling　capacity　of　the　specimens　were　analyzed,　and　compared　with　the　calculation　results　of　the　European　steel　standard　EN　1993-1-4　and　the　Chinese　steel　standard　GB50017-2003.　The　results　show　that　the　test　data　is　higher　than　the　calculation　results　in　EN　1993-1-4,　but　generally　lower　than　those　in　GB50017-2003.Therefore,　the　design　curves　in　EN　1993-1-4　are　generally　conservative,　and　the　curve　in　GB50017-2003　should　be　adjusted　correspondingly.　©,　2015,　Southeast　University.　All　right　reserved.