There　is　often　obvious　particle　breakage　for　silica　sand　under　high-stress,　which　will　lead　to　the　bearing　capacity　reduction　and　excessive　settlement　of　the　foundation.　This　paper　focuses　on　the　particle　breakage　characteristics　of　marine　silica　sand　from　the　East　China　Sea　under　high-stress　conditions.　A　series　of　conventional　triaxial　tests　for　silica　sand,　including　consolidated　drained　(CD)　and　consolidated　undrained　(CU)　shear　tests,　were　conducted　under　the　confining　pressures　in　the　range　of　2-8　MPa　to　investigate　the　breakage　rule　during　the　shearing　process.　The　developments　of　particle　breakage　index　Br　with　axial　strain　epsilon　1　and　volumetric　strain　epsilon　v　present　hyperbolic　and　linear　trends,　respectively.　A　hyperbolic　model　was　adopted　to　describe　the　relationship　of　Br　and　epsilon　1　and　the　corresponding　model　parameters　were　obtained.　The　particle　breakage　index　also　has　a　good　correlation　with　the　input　work　per　unit　volume　under　various　average　stresses,　regardless　of　the　stress　history.　Furthermore,　the　relationship　between　the　fractal　dimension　and　the　particle　breakage　was　studied　based　on　the　particle　size　distribution　curve.　It　is　concluded　that　the　fractal　dimension　increases　in　an　up-convex　hyperbolic　trend　with　the　increase　of　particle　breakage　index.　The　dividing　radius　for　whether　the　silica　sand　particles　exhibit　the　fractal　features　is　determined　as　approximately　0.4　mm.　This　is　anticipated　to　provide　reference　and　supplementary　test　data　for　analyzing　sand　constitutive　models/environments　regarding　particle　crushing.