In　order　to　examine　the　flange　local　stability　of　T-rib　stiffened　plates　under　compression,　considering　the　variation　of　flange　width　thickness　ratio,　T-rib　stiffened　plates　with　Q345　strength　(5　pieces)　and　Q420　strength　(4　pieces)　were　fabricated　to　carry　out　the　local　stability　axial　compression　test,　and　the　finite　element　(FE)　models　were　established　to　compare　with　the　test.　The　influence　of　different　material　constitutions,　simplified　welding　residual　stresses　and　local　initial　geometric　imperfections　on　the　mechanical　properties　of　the　flange　were　analyzed.　The　simplified　calculation　formula　for　the　local　stability　of　the　flange　was　obtained.　The　results　show　that　both　the　test　and　the　FE　model　are　subjected　to　the　local　buckling　failure　near　the　flange　height　of　1/2,　and　the　larger　the　flange　width-thickness　ratio　is,　the　earlier　the　specimen　comes　to　local　buckling　failure.　The　FE　models　are　simulated　by　an　ideal　elastic-plastic　constitutive　model.　With　increase　of　the　relative　flange　width-thickness　ratio,　the　axial　stiffness　of　the　component　decrease　because　of　the　inclusion　of　residual　stress.　The　coefficient　of　stability　is　smallest　when　local　initial　imperfections　are　included.　The　curve　of　the　simplified　formula　for　the　flange　local　stability　fitted　by　cubic　polynomial　is　close　to　the　trend　of　the　Eurocode　curve,　while　the　curve　fitted　by　Perry　formula　is　close　to　the　trend　of　the　Chinese　and　American　standard　curves.　The　trend　of　formula　curves　fitted　with　different　steel　strengthes　is　basically　the　same,　which　can　be　calculated　by　Perry　formula　for　a　safer　result.　©　2023　China　National　Publications　Import　and　Export　(Group)　Corporation.　All　rights　reserved.