The　nature　and　distribution　of　Cu　species　in　Cu-SSZ-13　play　a　vital　role　in　selective　catalytic　reduction　of　NO　by　NH3　(NH3-SCR),but　existing　methods　for　adjusting　the　Cu　distribution　are　complex　and　difficult　to　control.Herein,we　report　a　simple　and　effective　ion-exchange　approach　to　regulate　the　Cu　distribution　in　the　one-pot　synthesized　Cu-SSZ-13　that　possesses　sufficient　initial　Cu　species　and　thus　provides　a　＂nat-ural　environment＂　for　adjusting　Cu　distribution　precisely.By　using　this　proposed　strategy,a　series　of　Cu-SSZ-13x　zeolites　with　different　Cu　contents　and　distributions　were　obtained.It　is　shown　that　the　dealu-mination　of　the　as-synthesized　Cu-SSZ-13　during　the　ion-exchange　generates　abundant　vacant　sites　in　the　double　six-membered-rings　of　the　SSZ-13　zeolite　for　relocating　Cu2+　species　and　thus　allows　the　redistribution　of　the　Cu　species.The　catalytic　results　showed　that　the　ion-exchanged　Cu-SSZ-13　zeolites　exhibit　quite　different　catalytic　performance　in　NH3-SCR　reaction　but　superior　to　the　parent　counterpart.The　structure-activity　relationship　analysis　indicates　that　the　redistribution　of　Cu　species　rather　than　other　factors　(e.g.,crystallinity,chemical　composition,and　porous　structure)　is　responsible　for　the　improved　NH3-SCR　performance　and　SO2　and　H2O　resistance.Our　work　offers　an　effective　method　to　pre-cisely　adjust　the　Cu　distribution　in　preparing　the　industrial　SCR　catalysts.