In　order　to　study　the　mechanical　response　of　stainless-cladding　(SC)　bimetallic　steel　with　different　cladding　ratios　under　earthquake,　tests　of　23　specimens　made　of　316L+Q235B　SC　bimetallic　steel　with　a　thickness　of　3+3mm　were　conducted　under　monotonic　tension　and　compression　loading　as　well　as　15　different　cyclic　loading　systems.　The　monotonic　and　cyclic　behavior,　macro-failure　and　micro-failure　modes　are　analyzed.　The　cyclic　envelop　curves　are　fitted　by　using　the　Ramberg-Osgood　three-parameter　model　and　compared　with　the　monotonic　tensile　curves.　Based　on　the　Chaboche　plastic　constitutive　model,　relevant　parameters　for　the　SC　bimetallic　steel　are　calibrated,　and　the　tests　are　simulated　numerically.　Comparative　analysis,　such　as　steel　with　different　cladding　ratios　on　cyclic　envelop　curve,　cyclic　constitutive　relation　and　hysteresis　curves　are　carried　out.　The　experimental　results　show　that　the　SC　bimetallic　steel　with　larger　cladding　ratios　still　exhibits　significant　cyclic　strengthening　under　cyclic　loading.　Mixed　hardening　characteristics　are　observed,　including　isotropic　and　kinematic　hardening.　The　hysteretic　curves　are　plump.　With　an　increase　of　cyclic　number,　unloading　stiffness　and　initial　stiffness　of　the　reloading　curves　are　significantly　degraded.　The　Ramberg-Osgood　model　fits　the　cyclicenvelop　curves　well.　The　constitutive　model　proposed　herein　is　proved　good　for　simulating　the　cyclic　responses　of　the　SC　bimetallic　steel.　The　specific　mechanical　indexes　of　the　SC　bimetallic　steel　and　3+5mm　thickness　316L+Q235B　SC　bimetallic　steel　under　cyclic　loading　are　significantly　different.　The　research　results　provide　an　important　basis　for　developing　a　uniform　cyclic　constitutive　model　of　the　advanced　bimetallic　steel.　©　2019,　Editorial　Office　of　China　Civil　Engineering　Journal.　All　right　reserved.