As　a　new　type　of　structural　system,　the　cast-in-situ　reinforced　concrete　grillage　shear　wall　system　has　functions　of　formwork,　strength　and　heat　preservation　at　the　same　time.　It　is　suitable　for　residential　buildings　in　seismic　and　non-seismic　areas.　The　results　of　quasi-static　tests　on　20　specimens　of　small　and　large　grid　size　grillage　shear　walls　with　different　shear　span　ratios　show　that:　both　of　small　and　large　grid　size　grillage　shear　walls　have　excellent　seismic　performance;　shear　or　bending　deformation　of　horizontal　and　vertical　limbs　dissipate　seismic　energy　so　the　elastic-plastic　deformability　of　grillage　shear　walls　meet　the　requirements　of　shear　wall　structure　under　strong　earthquakes;　the　bearing　capacity　of　grillage　shear　wall　was　calculated　with　formulas　used　for　solid　RC　shear　walls.　The　equivalent　thickness　of　grillage　shear　wall　equalized　as　solid　shear　wall　is　determined　by　elastic　finite　element　analysis.