The　microcrack　evolution　mechanism　of　high-temperature　rock　has　received　widespread　study.　However,　the　systematic　summary　is　still　lacking.　The　research　progress　of　the　microcrack　evolution　mechanism　of　high-temperature　rock　is　systematically　summarized　from　four　perspectives,　including　slow　heating　and　cooling　effect,　thermal　shock　effect,　stress　effect,　and　the　combined　effects　of　high-temperature　and　stress.　The　evolution　of　microcracks　in　high-temperature　rock　is　described　in　detail.　The　application　of　advanced　experimental　techniques　into　the　study　of　microcrack　evolution　mechanism　was　introduced,　including　acoustic　emission　(AE),　ultrasound　wave,　mercury　intrusion　technology,　nuclear　magnetic　resonance　(NMR)　technology,　optical　microscope,　scanning　electron　microscope　(SEM)　and　computer　tomography　(CT)　scanning　technology.　The　limitations　of　existing　research　are　pointed　out,　including　the　lack　of　research　on　microstructural　changes　under　the　coupling　effects　of　multiple　physical　fields　and　multiphase　media,　and　the　lack　of　research　on　establishing　quantitative　relationships　between　microstructural　parameters　and　macroscopic　physical　and　mechanical　parameters.　The　research　trend　of　microcracking　properties　in　high-temperature　rocks　is　described　from　two　aspects,　including　the　multi　technology　joint　monitoring　and　the　establishment　of　macro-micro　quantitative　relationships.　©　2025　Xi＇an　Jiaotong　University.　All　rights　reserved.