Traditional　ordinary　Portland　cement　(OPC)　repair　materials　with　high　carbon　emissions　and　low　bond　strength,　urgently　need　to　be　improved.　A　one-part　electric　furnace　nickel　slag-based　geopolymer　(OENG)　repair　material　was　prepared　through　mechanical　activation.　Also,　the　effects　of　silicate　modulus　and　alkali　dosage　on　the　properties　of　compressive　strength,　bond　strength,　and　drying　shrinkage　were　investigated,　then　analysed　using　XRD,　DTG,　MIP,　and　SEM　microscopic　tests.　Results　indicate　that　the　compressive　strength,　flexural　strength,　and　bond　strength　of　OENG　repair　mortars　first　rise　and　then　fall　as　the　silicate　modulus　and　alkali　dosage　increase.　In　contrast,　the　trend　of　drying　shrinkage　is　the　opposite.　The　specimen　with　a　silicate　modulus　of　1.2　and　an　alkali　dosage　of　6.0　exhibits　the　best　performance.　The　hydration　product　has　a　dense　pore　structure　and　maximum　adhesion　of　7.3　MPa,　which　is　superior　to　the　OPC　mortar　matrix　and　meets　the　performance　requirements　of　repair　materials.　This　study　provides　a　theoretical　basis　for　the　application　of　one-part　electric　furnace　nickel　slag-based　geopolymer　in　building　repair.