This　study　investigated　the　effects　of　freezing　temperature　on　the　failure　modes　of　frozen　sandstone　under　uniaxial　compression　loading　conditions.　First,　the　sandstone　specimens　were　subjected　to　freezing　treatments　at　different　temperatures　(e.g.,　20,　0,　-　5,　-　10,　-　15　and　-　20　degrees　C),　and　uniaxially　compressed　to　failure　in　the　frozen　state.　Subsequently,　the　real-time　CT　scanning　was　performed　to　observe　the　spatial　three-dimensional　and　planar　two-dimensional　fracture　morphology　of　the　failed　specimens.　Next,　the　volumetric　porosity　and　crack　area　were　introduced　to　quantitatively　describe　the　freezing　temperature　effects　on　the　damage　degree　of　specimens　after　compression　failure.　Finally,　the　box-counting　dimension　of　cracks　calculated　by　fractal　theory　and　distribution　images　of　crack　orientation　angle　were　used　to　quantitatively　evaluate　freezing　temperature　effects　on　the　compression　failure　complexity　of　specimens.　The　results　show　that　the　tension-shear　failure　mode　to　shear　failure　mode　occurs　as　temperature　decreases,　and　the　failure　mode　tends　to　be　constant　below　-　10　degrees　C.　The　volumetric　porosity　and　crack　area　of　the　failed　specimen　decrease　as　temperature　decreases.　After　specimen　failure,　the　box-counting　dimension　of　cracks　decreases　as　temperature　decreases,　and　the　distribution　range　of　crack　orientation　angle　decreases,　which　indicates　the　failure　complexity　decreases.