The　application　of　stainless　steel　tubes　in　concrete-filled　steel　tube　systems　can　significantly　improve　their　corrosion　resistance　in　comparison　with　those　that　employ　carbon　steel　tubes.　In　this　paper,　a　series　of　push-out　tests　were　carried　out　to　investigate　the　bond　stress-slip　behavior　between　stainless　steel　tubes　and　concrete.　A　total　of　14　concrete-filled　square　stainless　steel　tube　specimens　were　tested,　covering　two　cross-sectional　width-thickness　ratios　(B/t　=　30　and　50),　two　concrete　strength　(f(cu)　=　44　and　76　MPa),　three　rib　stiffener　types　(ordinary,　saw-shaped　and　perfobond　leister)　and　two　stainless　steel　grades　(austenitic　and　duplex).　The　test　results　indicate　that　B/t,　f(cu)　and　stainless　steel　grade　have　noticeable　influences　on　the　ultimate　bond　stress　(tau(u))　in　concrete-filled　square　stainless　steel　tube　and　the　addition　of　rib　stiffeners　significantly　improves　the　bond　behavior.　The　bond　mechanism　at　different　stages　of　loading　and　the　effect　of　various　parameters　on　tau　u　are　discussed.　Based　on　the　test　results,　an　idealized　bond　stress-slip　strain　(tau-epsilon(S))　curve　was　proposed,　where　good　agreement　between　the　test　and　the　proposed　model　has　been　achieved.