Carbonation　leads　to　the　decrease　of　alkalinity　of　concrete,　which　seriously　harms　the　durability　of　reinforced　concrete　structures.　In　this　paper,　Na2　SiO3　,　NaOH　and　Na2　CO3　were　used　as　alkali　activators,　and　the　influences　of　the　types　of　alkali　activators　and　Na2　O　equivalent　on　the　carbonation　resistance　of　single-component　alkali-activated　nickel　slag　cement　mortar　were　investigated.　The　results　show　that,　when　the　Na2　O　equivalent　is　the　same,　the　carbonation　resistance　of　single-component　alkali-activated　nickel　slag　cement　mortar　is　the　best　in　the　single　doping　of　NaOH　samples,　and　the　carbonation　resistance　is　the　worst　in　the　single　doping　of　Na2　SiO3　samples.　Na2　CO3　partial　substitution　for　Na2　SiO3　can　improve　the　carbonation　resistance　of　cement　mortar　samples,　while　the　effect　of　Na2　CO3　partial　substitution　for　NaOH　on　the　carbonation　resistance　of　cement　mortar　specimens　is　related　to　the　Na2　O　equivalent.　With　the　increase　of　Na2　O　equivalent,　the　carbonation　resistance　of　single　doping　of　Na2　SiO3　and　mixed　doping　of　Na2　SiO3　&Na2　CO3　(3　∶　1)　samples　increases　first　and　then　decreases.　The　carbonation　resistance　of　single　doping　of　NaOH　samples　increases　continuously　in　the　early　stage,　and　increases　first　and　then　decreases　in　the　later　stage.　The　carbonation　resistance　of　mixed　with　NaOH&Na2　CO3　(3　∶　1)　samples　improves　in　the　early　stage,　but　decreases　in　the　later　stage.　©　2023　Bulletin　of　the　Chinese　Ceramic　Society.　All　rights　reserved.