Reinforced　concrete　composite　perforated　core　wall　with　concealed　steel　truss　has　been　proposed.　This　new　composite　core　wall　includes　two　kinds　of　composition.　One　is　composition　of　two　bearing　systems,　including　truss　and　core　wall,　the　other　is　composition　of　two　materials,　including　steel　and　concrete.　Two　1/6　scale　perforated　core　walls　specimens　were　designed,　including　a　normal　reinforced　concrete　perforated　core　wall　and　a　reinforced　concrete　composite　perforated　core　wall　with　concealed　steel　truss.　The　experimental　research　on　their　seismic　performance　under　cyclic　loading　was　carried　out.　Their　load-carrying　capacity,　stiffness,　ductility,　hysteretic　behavior,　energy　dissipation　and　failure　phenomena　of　the　core　walls　are　discussed.　The　test　results　show　that　the　seismic　performance　of　core　wall　is　improved　greatly　by　the　concealed　steel　truss.　The　mechanical　models　for　calculating　load-carrying　capacity　of　the　core　wall　are　proposed,　and　the　theoretical　results　agree　well　with　those　from　experiments.　Some　suggestions　for　seismic　design　of　this　new　composite　perforated　core　wall　are　proposed.