In　order　to　study　the　damage　evolution　law　of　reinforced　concrete　grid　shear　wall　under　earthquake　action,　the　existing　two-parameter　earthquake　damage　model　of　reinforced　concrete　members　is　modified,　and　the　earthquake　damage　model　suitable　for　grid　shear　wall　is　proposed.　Using　the　grey　incidence　method,　the　test　information　of　grid　shear　wall　is　analyzed,　the　key　design　parameters　are　determined,　and　the　formula　for　calculating　the　combined　coefficient　of　damage　model　is　given.　The　effects　of　shear　span　ratio,　axial　load　ratio,　vertical　limb　width　and　transverse　limb　height　on　the　damage　of　grid　shear　wall　are　studied,　and　the　relationship　between　the　main　parameters　and　the　damage　evolution　of　grid　shear　wall　is　obtained.　Based　on　the　proposed　damage　model,　the　damage　index　of　grid　shear　walls　is　calculated.　According　to　the　damage　state　of　specimens,　grid　shear　walls　were　divided　into　five　damage　levels　including　basically　intact,　mild　damage,　moderate　damage,　severe　damage　and　collapse　failure,　and　the　damage　index　range　of　different　damage　states　was　calibrated.　©　2024　Editorial　office　of　Earthquake　Engineering　and　Engineering　Dynamics.　All　rights　reserved.