The　behavior　of　loose　sand-structure　interface　under　the　high　frequency　cycle　shearing　is　analyzed　by　using　Particle　Discrete　Element　Method　(DEM).　The　changes　of　sand　box　porosities　of　DEM　model　and　sand　volume　strains　are　examined　in　detail.　The　results　show　that　sand　volumetric　shrinkage　due　to　shearing　is　not　obvious　in　spite　of　the　larger　loose　sand　particle　friction　coefficients　and　particle　stiffness.　The　particle　stiffness　ratio　has　a　little　effect　on　the　mechanical　properties　of　sands.　In　addition,　the　decrease　in　volume　of　sand　under　shearing　is　more　obvious　with　the　increase　of　the　confining　pressures.　Moreover,　the　decrease　in　volume　of　loose　sand　under　shearing　is　greater　with　the　increase　of　the　high　frequency　cycle　shear　amplitude　and　the　shear　frequency.