In　order　to　study　shear　behaviors　of　sand　under　different　stress　path,　eight　monotonic　shearing　tests　with　different　stress　path　were　performed.　It　shows　that,　under　different　stress　path,　shear　dilatancy　behaviors　of　sand　are　obviously　different:　it　has　more　notable　shear　dilatancy　behaviors　under　extension　than　under　compression,　in　the　case　of　compression,　more　notable　shear　dilatancy　behaviors　revealed　under　decompression　compression　path,　and　most　unconspicuous　shear　dilatancy　behaviors　under　pressurized　shearing　path,　and　its　shear　dilatancy　behaviors　under　conventional　compression　path　are　between　two　former　conditions.　Under　deviatoric　stress　consolidation,　it　shows　more　obvious　shear　dilatancy　behaviors.　And　that,　if　stress　paths　are　different,　internal　friction　angles　of　sand　are　different,　which　is　3°-4°　bigger　under　triaxial　extension　than　under　triaxial　compression.　Under　the　same　condition　of　compression　or　extension,　no　matter　what　different　stress　loaded,　all　internal　friction　angles　tend　to　the　same　stress　ratio　at　the　critical　state　ultimately.