The　behavior　of　dense　sand-structure　interface　undergoing　the　high　frequency　cycle　shear　was　studied　by　Particle　Discrete　Element　Method　(DEM).　The　change　of　the　porosity　sand　and　volumetric　strains　were　examined　in　detail.　The　results　showed　that　the　dilatation　of　sand　is　less　obvious　with　the　increase　in　the　particle　friction　coefficient　of　dense　sand.　The　larger　the　dense　sand　particle　stiffness　is,　the　stronger　the　sand　dilatation　becomes.　The　particle　stiffness　ratio　has　a　little　effect　on　the　mechanical　properties　of　sand.　In　addition,　the　increase　in　volume　of　sand　under　shearing　is　not　obvious　with　the　increase　of　the　confining　pressures.　Moreover,　the　increase　in　sand　shear　dilatation　under　shearing　is　greater　with　the　increase　in　the　high　frequency　cycle　shear　amplitude.　The　sand　shear　dilatation　is　not　affected　by　the　shear　frequency.