It　is　well　known　that　Soil　and　Structure　Interaction　(SSI)is　very　important　to　study　the　dynamic　response　of　underground　structure,　where　the　description　of　contact　performance　between　soil　and　structure　is　a　key　problem.　Now,　there　have　been　many　research　fruits　on　the　aspect,　but　the　literature　about　the　influence　of　loading　frequency　on　contact　performance　between　soil　and　structure　is　few.　So,　Using　the　Suspensory　Ring　Test　Apparatus　designed　by　the　authors,　some　tests　have　been　carried　out　in　order　to　study　this　problem.　The　test　soil　is　clay　silt　with　fine　sand,　whose　physical　properties　are　that　ρ　-　1.　59g/cm3,　ω　=14.39%,　ωP　=　14.26%,　ωL　=　21.77%,　and　the　test　structure　is　a　smooth　plain　concrete　plate.　In　this　paper,　the　test　results　are　analyzed,　and　some　conclusions　are　gained.　Firstly,　destroy　of　silt-structure　system　is　found　in　the　silt-structure　interface.　Secondly,　contact　performance　between　the　silt　and　the　structure　is　different　with　different　loading　frequency.　Finally,　progressive　failure　of　the　silt-structure　interface　is　described,　and　an　experiential　formula　is　proposed.