This　study　investigates　the　size　effect　on　the　seismic　performance　of　Carbon　Fiber　Reinforced　Polymer　(CFRP)strengthened　shear　walls　through　experimental　and　analytical　approaches.　Twelve　CFRP-strengthened　shear　wall　specimens　with　varying　widths　(600　mm　to　1800　mm)　and　CFRP　ratios　(0.00　%　to　0.21　%)　were　tested.　The　results　revealed　that　both　nominal　shear　strength　and　seismic　performance　indicators　exhibited　size-dependent　behavior.　Specifically,　as　wall　width　increased　from　600　mm　to　1800　mm,　the　nominal　shear　strength　decreased　by　up　to　40.0　%,　while　ductility　and　energy　dissipation　factors　were　reduced　by　51.2　%　and　45.3　%,　respectively.　Additionally,　with　an　increasing　CFRP　ratio,　the　nominal　shear　strength　increases,　while　the　size　effect　gradually　diminishes.　Based　on　these　findings,　size-dependent　formulas　were　established　to　describe　the　influence　of　structural　size　and　CFRP　ratio　on　the　nominal　shear　strength　of　CFRP-strengthened　shear　walls.