Despite　the　excellent　mechanical　and　environmental　properties　of　alkali-Activated　materials,　the　susceptibility　to　early　cracking　significantly　limits　their　widespread　application　in　engineering.　Tensile　creep　plays　a　key　role　in　the　early　stages　by　relaxing　shrinkage-induced　tensile　stresses　and　delaying　the　onset　of　cracking.　Therefore,　the　effect　of　stainless　steel　slag　(SS)　on　the　tensile　creep　of　alkali-Activated　slag-SS　mortar　(ASM)　with　SS　contents　of　0%,　10%,　20%,　30%,　and　40%　was　investigated.　SS　content　represents　the　mass　ratio　of　SS　to　the　sum　of　SS　and　slag.　The　mechanical　properties,　autogenous　shrinkage,　and　tensile　creep　of　ASM　were　studied.　The　results　demonstrate　that　the　tensile　creep　decreases　with　the　increase　of　SS　contents.　Increasing　the　SS　content　reduced　the　hydration　of　ASM,　leading　to　a　lower　amount　of　calcium-Aluminum-silicate-hydrate　(C　A　S　H)　gels,　and　consequently　reduced　autogenous　shrinkage.　Autogenous　shrinkage　is　the　primary　driver　of　tensile　creep.　Furthermore,　an　increase　in　SS　content　resulted　in　a　decrease　in　the　amount　of　sodium　ions　adsorbed　by　the　C　A　S　H　gel,　which　can　limit　the　relative　slip　of　the　C　A　S　H　gel.　Therefore,　increasing　the　SS　content　decreases　the　tensile　creep　of　ASM.　©　2025　American　Society　of　Civil　Engineers.