Attribute　to　its　high　strength　and　low　alloy　cost，S35657　austenitic　stainless　steel　is　more　suitable　for　engineering　application　as　structural　steel.　However，further　studies　are　required　to　investigate　the　effect　of　S35657　grade　on　the　performance　of　concrete　filled　steel　tubular（CFST）columns.　Aiming　to　study　the　behavior　of　concrete　filled　S35657　stainless　steel　tubular（CFSST）columns　under　combined　compression　and　bending，tests　on　16　CFST　columns　were　carried　out　with　main　parameters　including　section　type（circular　and　square），slenderness　ratio（22，26，43　and　50）and　eccentricity（0，40　mm　and　60　mm）.　The　test　results　show　no　obvious　difference　in　the　failure　modes　of　CFST　columns　by　using　S35657　stainless　steel　and　Q355　mild　steel.　However，the　bearing　capacity　of　CFSST　columns　is　about　12%　higher　than　that　of　CFST　columns　with　Q355　steel，and　this　value　decreases　with　the　increase　of　the　eccentricity　and　slenderness　ratio.　Meanwhile，current　design　codes　underestimate　the　bearing　capacity　of　CFSST　column　with　S35657　stainless　steel.　Finite　element（FE）model　was　established　and　verified　by　the　test　results.　Parametric　studies　were　conducted　using　the　FE　model　to　explore　the　effects　of　the　concrete　strength，steel　ratio　and　slenderness　ratio　on　the　bearing　capacity　of　the　CFSST　columns　with　S35657　stainless　steel.　The　results　show　that　the　stability　coefficient　of　CFSST　columns　with　S35657　stainless　steel　decrease　with　the　growth　of　the　slenderness　ratio　and　the　steel　ratio，while　concrete　strength　has　non-significant　effect　on　it.　Moreover，the　slenderness　ratio，steel　ratio　and　concrete　strength　have　obvious　influence　on　the　relative　axial　load　versus　relative　moment　curves　of　CFSST　columns　with　S35657　stainless　steel.　Based　on　the　parametric　analysis，the　predictive　method　for　bearing　capacity　recommended　by　technical　specification　of　T/CECS　952—2021　was　modified　and　the　prediction　accuracy　was　improved　by　25%.　©　2025　Science　Press.　All　rights　reserved.