Understanding　the　alteration　in　rock　mechanics　post　heating　and　cyclic　cooling　is　crucial　for　hot　dry　rock　geothermal　energy　extraction　projects.　Against　this　backdrop,　a　constitutive　model　adept　at　delineating　rock　behavior　under　cyclic　heating-cooling　scenarios　is　introduced.　The　model　presumes　rock　micro-element　failure　to　adhere　to　the　Weibull　distribution　and　is　constructed　upon　an　octahedral　shear　stress　strength　criterion,　integrating　thermal　and　mechanical　damage　statistics.　Model　parameters　were　derived　via　the　peak　point　method.　The　model＇s　validity　was　ascertained　through　heating-cycle　cooling-uniaxial　compression　experiments　on　hot　dry　granite.　The　experimental　outcomes　substantiate　the　model＇s　efficacy.　Within　the　model,　the　parameters　r　and　S　are　not　only　of　practical　physical　significance　but　also　serve　as　indices　to　quantify　rock　brittleness　and　peak　strength,　respectively.　The　findings　of　this　study　are　expected　to　contribute　theoretical　insights　for　deep　geotechnical　engineering　applications,　including　geothermal　resource　extraction.　©　2024