To　meet　the　requirement　of　reinforced　concrete　(RC)　grillage　shear　wall　residence　buildings　of　6-story　or　less,　the　grillage　shear　wall　with　grid　size　of　400　mm　×　400　mm,　which　is　called　large　grid　size　shear　wall,　has　been　developed.　Quasi-static　tests　on　two　specimens　with　shear　span　ratio　of　2.02　and　two　specimens　with　shear　span　ratio　of　1.13　were　carried　out　to　study　the　seismic　behavior,　such　as　failure　mode,　hysteretic　characteristics,　deformation　capacity　and　bearing　capacity,　of　the　large　grid　size　shear　walls.　The　test　results　indicate　that　vertical　cracks　at　the　ends　of　horizontal　limbs　extend　over　the　entire　height　of　the　limb,　horizontal　cracks　appear　at　the　vertical　limbs,　concrete　crashes　at　the　bottom　of　the　boundary　vertical　limbs,　the　hysteretic　loops　of　the　lateral　load-displacement　are　pinch,　the　ultimate　drift　ratio　is　not　less　than　1/60.　The　elastic　finite　element　analysis　shows　that　the　large　grid　size　RC　wall　with　thickness　of　120mm　can　be　equalized　to　the　RC　shear　wall　with　thickness　of　60　mm.　Its　bending　capacity　under　compressive　force　can　be　calculated　by　the　current　code　formula　for　the　RC　shear　wall　with　thickness　of　60　mm,　but　a　reduction　factor　of　0.9　should　be　multiplied.　Earthquake　resistant　calculating　results　of　an　engineering　example　show　that　the　large　grid　size　RC　grillage　wall　system　is　suitable　for　the　6-story　or　less　residence　building　which　the　seismic　fortification　intensity　is　8.