In　high-temperature　geological　engineering　applications,　cyclic　loads　induced　by　various　factors　(e.g.,　earthquakes,　excavation,　and　blasting)　can　exacerbate　the　thermal　damage　of　engineered　rock　formations.　Therefore,　this　study　investigates　the　mechanical　properties　and　microstructure　evolution　of　thermally　treated　granite　subjected　to　cyclic　loading.　First,　the　mechanical　property　variations　of　thermally　treated　granite　under　cyclic　loading　were　studied　through　cyclic　loading　experiments.　Subsequently,　nuclear　magnetic　resonance　(NMR)　was　employed　to　examine　the　microstructure　evolution　of　thermally　treated　granite　under　cyclic　loading.　Lastly,　the　effects　of　cyclic　loading　on　maximum　strain,　Young＇s　modulus,　pore　size　distribution,　and　porosity　of　thermally　treated　granite　were　discussed.　Results　indicate　that　at　the　same　number　of　cycles,　maximum　strain　increases　with　increasing　temperature,　while　Young＇s　modulus　decreases.　For　granite　subjected　to　the　same　thermal　treatment,　the　maximum　strain　increases　as　the　cyclic　number　increases,　while　Young＇s　modulus　decreases.　Concurrently,　porosity　and　fractal　dimension　initially　decrease　and　then　increase　with　a　rising　number　of　cycles.　©　2024　John　Wiley　&　Sons　Ltd.