The　resonance　compaction　of　deep　silty　sand　ground　was　simulated　using　a　particle　discrete　element　method,　The　behaviors　of　properties　of　the　porosity,　displacement　and　pore　pressure　in　soil　were　analyzed　during　the　process　of　resonance　compaction,　and　the　mechanical　characters　of　soils　around　a　vibrio-rod　were　researched.　Simultaneously,　the　effects　of　the　vibration　frequency　and　amplitude　and　particles　gradation　on　soil　compaction　were　also　investigated.　The　results　show　that　the　high　frequency　resonance　compaction　method　is　most　suitable　for　the　deep　sandy　ground　improvement.　During　the　construction　process　of　resonance　compaction,　soil　porosities　decrease　dramatically　and　the　surface　displacement　is　obvious.　The　mechanical　characters　of　soil　around　the　vibrio-rod　are　also　changed　greatly.　The　vibration　frequency,　amplitude　of　a　vibrio-rod　and　the　grain　composition　of　soil　can　affect　the　dense　degree　of　the　ground.　It　can　obtain　the　densest　degree　under　the　resonant　vibration　frequency　and　appropriate　amplitude　according　to　the　characteristics　of　soil　in　a　construction　project.