The　cast-in-situ　reinforced　concrete　grillage　shear　wall　is　a　new　type　of　structural　system,　which　has　the　functions　of　formwork　and　heat-preservation　at　the　same　time.　The　grillage　shear　wall　is　built　with　heat　preservation　hollow　blocks　which　are　made　of　expanded　polystyrene　(EPS)　concrete.　For　applying　the　wall　to　rural　houses,　a　system　of　grillage　shear　wall　with　large　grid　size　and　low　reinforcement　ratio　has　been　developed.　Pseudo-static　test　of　a　specimen　was　carried　out　to　study　the　seismic　behavior　of　the　grillage　shear　wall,　such　as　failure　mode,　load-carrying　capacity　and　deformation　capacity.　The　test　results　indicate　that:　vertical　and　cross　oblique　cracks　appear　at　the　ends　of　horizontal　limbs　above　the　hole,　while　horizontal　cracks　occur　at　the　vertical　limbs,　the　concrete　crushes　at　bottom　of　boundary　limbs,　the　load-carrying　capacity　can　meet　the　requirements　for　the　one-story　residential　buildings　with　seismic　fortification　intensity　8.