In　order　to　investigate　the　formation　mechanism　of　soil　plugging　effect　when　a　large-diameter　bored-pile　sleeve　is　penetrated　by　high　frequency　hammers,　numerical　simulation　analyses　were　performed　by　using　the　3D　granular　discrete　element　method.　Variations　in　the　displacements,　velocities,　contact　stresses　of　soil　particles　inside　and　outside　the　sleeve,　the　height　of　soil　plug　and　as　well　the　porosity　and　shear　stresses　in　soil　plug　with　sleeve　driving　were　investigated　numerically.　The　numerical　results　show　that　the　larger　the　high-frequency　exciting　force　is,　the　larger　the　driving　depth　of　a　sleeve　and　the　height　of　soil　plug　inside　the　sleeve　are.　At　the　meantime,　the　maximum　fluctuation　range　and　fluctuation　amplitude　of　pore　water　pressure　are　large　with　the　increase　of　the　exciting　force.　Porosity　in　soil　plug　is　larger　at　its　top　than　at　its　lower　part.　During　the　process　of　the　sleeve　driven　by　a　high　frequency　hammer,　the　maximum　amplitude　of　pore　water　pressure　appears　at　sleeve　end.　The　larger　the　penetration　depth　is,　the　larger　the　pore　water　pressure　becomes.　Displacements　of　soil　particles　in　the　sleeve　are　small　at　the　beginning.　The　contact　number　of　soil　particles　at　sleeve　end　raises　with　the　increases　of　driving　depth　and　vibration　frequency.　Moreover,　contact　stresses　and　shear　stresses　at　sleeve　end　are　larger　than　those　in　other　regions.