The　artificial　frozen　wall　crossing　the　water-rich　sand　layer　is　prone　to　failure　during　thawing.　To　study　the　loading　fracture　characteristics　and　damage　evolution　of　single-fissured　sandstone　after　thawing,　quasi-sandstones　with　prefabricated　single　fissure　at　different　angles　were　prepared　using　the　sandstone　of　the　Luohe　Formation　as　the　original　rock　to　conduct　freeze-thaw　tests　with　various　temperature　differences,　and　triaxial　compression　tests　were　performed　on　the　samples.　Based　on　the　distribution　theory　of　rock　micro-element　strength　and　static　elastic　modulus,　a　damage　constitutive　model　of　single-fissured　quasi-sandstone　under　freezing-thawing　and　confining　pressure　was　established.　The　results　show　that　with　the　decrease　in　freezing　temperature,　the　amount　of　flake　spalling　on　the　sample　surface　increases,　and　the　frost-heaving　cracks　of　quasi-sandstone　become　more　numerous　and　longer,　which　makes　the　single-fissured　quasi-sandstone　tend　to　have　a　more　complex　tensile-shear　hybrid　failure　than　a　shear　failure.　Moreover,　with　the　increase　in　fissure　angle,　the　absolute　value　of　the　freezing　temperature　required　to　produce　frost-heaving　cracks　increases.　An　S-shaped　damage　evolution　curve　corresponds　to　each　stage　of　triaxial　compression　of　single-fissured　quasi-sandstone.　With　the　decrease　in　freezing　temperature,　the　strength　of　rock　after　thawing　decreases,　and　the　brittleness　characteristics　strengthen.