Prefabricated　insulation　grid　shear　walls　are　a　new　type　of　wall　which　integrates　structure,　insulation　and　formwork.　A　grid-like　reinforced　concrete　shear　wall　with　vertical　and　transverse　limbs　is　formed　by　casting　concrete　into　the　reserved　vertical　and　transverse　hollow　cavities　in　the　prefabrication　of　cement　polystyrene　granular　concrete　wall　formworks.　In　this　paper,　based　on　an　earthquake　engineering　simulation　open　system　(OpenSees),　a　new　modeling　approach　for　grid　shear　walls　is　proposed,　and　nonlinear　analysis　of　two　grid　walls　with　different　grid　sizes　under　cyclic　load　is　carried　out.　The　accuracy　and　effectiveness　of　the　grid　shear　wall　model　are　verified　by　comparison　of　the　predicted　hysteretic　response　and　experimental　results.　On　this　basis,　the　seismic　performance　of　grid　shear　walls　with　different　parameters　(axial　load　ratio,　vertical　reinforcement　ratio,　transverse　reinforcement　ratio　and　transverse　limb　height)　is　analyzed.　The　results　show　that　both　axial　load　ratio　and　vertical　reinforcement　ratio　can　significantly　improve　the　load　capacity　of　grid　shear　walls.　However,　with　an　increase　in　the　axial　load　ratio,　the　ductility　of　the　grid　shear　walls　decreases.　The　influence　of　transverse　reinforcement　ratio　and　transverse　limb　height　on　the　load　capacity　of　shear　wall　with　large　shear　span　ratio　is　relatively　small,　mainly　because　the　failure　mode　of　shear　wall　with　large　shear　span　ratio　is　bending　failure.　Based　on　parameter　influence　analysis,　design　suggestions　for　reinforcement　ratio　in　vertical　and　horizontal　limbs　and　the　height　of　the　transverse　limb　of　grid　shear　walls　are　put　forward.　The　research　in　this　paper　provides　a　reference　for　the　application　of　grid　shear　walls　in　engineering.