Out-of-plane　cyclic　loading　tests　of　six　shear　wall　specimens　were　conducted　to　study　the　out-of-plane　seismic　behavior　of　double　steel　plates　and　concrete　infill　composite　shear　walls　(SCW)　for　nuclear　power　engineering.　Five　SCW　specimens　and　one　reinforced　concrete　(RC)　shear　wall　specimen　were　investigated.　The　effect　of　the　parameters,　namely,　the　thickness　of　the　steel　plate,　the　vertical　load,　and　the　strength　grade　of　concrete,　on　the　out-of-plane　seismic　performance　of　a　double　steel　plates　concrete　infill　SCW　specimen　were　analyzed　experimentally.　The　SCW　specimens　had　good　bearing　capacity　and　lateral　stiffness.　However,　the　ductility　of　SCW　specimens　was　worse　than　that　of　RC　shear　walls　in　the　failure　stage.　The　thickness　of　steel　plate　and　the　vertical　load　significantly　influenced　the　out-of-plane　seismic　performance　of　SCW,　but　the　effect　of　the　strength　grade　of　concrete　was　not　obvious.　The　out-of-plane　cyclic　loading　test　of　SCW　was　simulated　by　using　the　finite　element　software　ABAQUS.　Simulation　results　of　ultimate　load　have　good　agreement　with　the　test　results.　On　the　basis　of　the　test　and　simulation　results,　a　formula　of　the　flexural　capacity　of　the　SCW　was　proposed　in　this　paper.　This　research　can　be　a　reference　for　the　design　of　SCW　for　nuclear　power　engineering.　©　2017,　Editorial　Department　of　Journal　of　HEU.　All　right　reserved.