Investigations　on　lateral-torsional　buckling　behavior　of　stainless　steel　welded　I-section　beams　were　carried　out　through　four-point　bending　tests.　The　Chinese　austenitic　stainless　steel　adopted　in　this　study　contains　approximately　17%　of　Cr,　which　could　be　graded　as　EN　1.4401.　The　non-linear　stress-strain　relationship　of　the　material,　the　residual　stress　distribution　of　the　section　and　the　ultimate　moment　capacity　of　the　welded　I-section　beams　were　obtained　from　the　experiments,　and　they　were　compared　with　those　results　predicted　by　analytical　models　recommended　by　several　researchers.　Besides,　a　new　model　is　proposed　to　predict　the　residual　stress　distribution　of　the　stainless　steel　welded　I-section　beams.