Cohesion　provided　by　pore　ice　is　a　critical　component　influencing　the　mechanical　behavior　of　frozen　soil,　as　it　not　only　cements　soil　particles　together　but　also　shares　the　external　loads　with　them.　In　view　the　crucial　role　of　cohesion　in　developing　an　elastoplastic　model　for　frozen　soil,　this　paper　employs　triaxial　tensile　strength　(TTS)　to　characterize　cohesion　and　proposes　a　TTS　degradation　expression　driven　by　plastic　shear　strain.　By　directly　incorporating　TTS　into　the　yield　function,　a　framework　for　a　Non-Orthogonal　Elastoplastic　(NOEP)　constitutive　model　that　accounts　for　cohesion　degradation　in　frozen　soil　is　developed.　Furthermore,　a　hardening　parameter　incorporating　TTS　is　introduced　and　used　in　conjunction　with　the　modified　yield　function　to　determine　the　magnitude　of　the　plastic　strain　increment.　The　non-orthogonal　plastic　flow　rule　is　used　to　determine　the　direction　of　the　plastic　strain　increment　based　on　the　modified　yield　function.　Ultimately,　by　combining　the　elastic　strain　increment　determined　by　Hooke＇s　rule,　a　NOEP　constitutive　model　incorporating　cohesion　degradation　for　frozen　soil　is　established.　The　validity　and　rationality　of　the　proposed　NOEP　model　in　representing　the　stress-strain　relationship　of　frozen　soil　are　confirmed　through　comparisons　with　test　results　of　frozen　soil　under　the　triaxial　compression　conditions.　The　proposed　constitutive　model　provides　a　more　comprehensive　and　precise　representation　of　frozen　soil＇s　response　to　external　loading,　enhancing　the　understanding　of　its　shear　deformation　behavior　and　providing　a　robust　theoretical　foundation　for　engineering　design　and　construction　in　cold　regions.