The　paper　studied　mechanical　properties　of　the　local　stability　of　in　aluminum　alloy　bending　members.　Using　FE　software　ANSYS,　9　specimen　models　(5　specimen　models　without　stiffener　and　4　models　with　stiffeners　in　the　midspan)　were　built　to　analyze　local　buckling　of　specimens.　To　simplify　substitution　of　imperfections　in　models,　a　method　of　“same　framework　with　average　imperfections”　for　aluminum　alloy　structures　was　proposed.　Analyzed　results　were　compared　with　experimental　results.　It　is　found　that　for　ultimate　bearing　capacity,　the　average　ratio　of　finite　element　analysis　results　to　corresponding　test　results　is　0.99,　and　the　standard　deviation　is　0.06.　Conclusion　is　that　the　proposed　FE　models　can　accurately　analyze　local　buckling　behavior　of　aluminum　alloy　members.　Meanwhile,　it　verifies　that　the　proposed　method　of　“same　framework　with　average　imperfections”　is　reliable.　The　suggested　models　provide　some　references　for　further　finite　element　parametric　analysis　on　more　types　of　the　aluminum　alloy　flexible　member.　©,　2015,　Editorial　Department　of　Journal　of　SJZU.　All　right　reserved.