In　this　paper,　mid-rise　shear　wall　with　concealed　truss　was　proposed.　This　new　composite　shear　wall　includes　two　kinds　of　composition:　one　is　the　composition　of　two　bearing　systems,　including　truss　and　shear　wall,　and　the　other　is　the　composition　of　two　materials,　including　steel　and　concrete.　Therefore,　it　is　a　double　composite　shear　wall.　The　experimental　study　on　the　seismic　behavior　of　six　1/3　scale　mid-rise　shear　walls,　including　an　ordinary　mid-rise　shear　wall,　a　mid-rise　shear　wall　with　steel　frame,　and　four　mid-rise　shear　wall　with　concealed　truss　made　of　different　materials,　was　studied.　Based　on　the　experimental　study,　the　stiffness　and　its　attenuation,　bearing　capacity,　ductility,　hysteretic　property,　energy　dissipation,　and　failure　phenomena　of　each　shear　wall　were　contrastively　analyzed.　The　formulas　of　bearing　capacity　and　stiffness　were　established.　The　results　obtained　from　the　formulas　and　those　from　experiment　are　in　good　agreement.　Some　suggestions　for　seismic　design　of　shear　wall　are　given　in　this　paper.　The　experimental　results　show　that　the　seismic　behavior　of　the　mid-rise　shear　wall　with　steel　frame　and　that　of　every　truss　with　different　materials　is　obviously　improved.　©　Higher　Education　Press　and　Springer-Verlag　2009.