In　order　to　research　the　overall　buckling　behavior　of　the　duplex　EN　1.4462　stainless　steel　I-shaped　columns　under　axial　compression,　experiments　on　eleven　full-scale　specimens　were　conducted.　According　to　the　initial　bending　measured　before　the　test,　and　loading　eccentricity　obtained　during　the　test,　failure　mode　and　buckling　capacity　of　all　the　columns　were　clarified　based　on　the　experimental　results,　and　calculated　results　were　compared　with　current　European　steel　structure　design　code　(EN　1993-1-4)　and　Chinese　steel　structure　design　code　(GB　50017-2003).　According　to　the　test　results,　all　the　specimens　fail　in　overall　buckling　mode　(five　are　strong　axis　buckling　mode　and　six　are　weak　axis　buckling　mode)　and　no　local　buckling　occurs,　and　torsional　phenomenon　is　observed　in　some　specimens.　Besides,　specimens　with　relatively　large　slenderness　are　prone　to　elastic　buckling,　and　specimens　with　relatively　small　slenderness　are　prone　to　elasto-plastic　buckling.　The　tested　buckling　strengths　are　relatively　higher　than　those　in　EN　1993-1-4,　indicating　that　the　design　curves　from　EN　1993-1-4　are　generally　conservative.　However,　the　test　values　are　relatively　lower　than　those　in　GB　50017-2003,　indicating　that　the　design　curves　from　GB　50017-2003　are　generally　unsafe.　©,　2015,　Science　Press.　All　right　reserved.