In　order　to　study　the　effect　of　cyclic　loading　frequency　on　the　liquefaction　characteristics　of　saturated　sand,　cyclic　torsional　shear　tests　with　vibration　frequencies　of　0.05Hz,　0.1Hz,　0.5Hz,　1Hz　and　2Hz　were　carried　out　on　Fujian　standard　sand　with　density　of　35%,　50%　and　70%,　respectively.　And　the　coral　sand　and　fine　sand　with　density　of　50%　were　further　tested　with　the　vibration　frequencies　of　0.1Hz　and　1Hz.The　experimental　results　show　that　the　shear　dilatancy　and　shrinkage　characteristics　of　both　loose　and　dense　sand　are　closely　related　to　the　loading　frequency　and　the　shear　dilatancy　characteristics　of　the　soil　is　significant　under　the　low-frequency　load.　The　pore　water　pressure　fluctuates　after　the　initial　liquefaction,　and　the　sandy　soil　still　has　the　ability　to　resist　liquefaction,　showing　a　＇hardening＇　liquefaction　mode.　Under　high　frequency　load,　the　soil　showed　significant　shear　shrinkage　characteristics.　The　pore　water　pressure　kept　stable　after　the　initial　liquefaction,　and　cyclic　liquefaction　model　exhibited　＇soften＇　characteristics.　The　pore　water　pressure　characteristics　and　liquefaction　model　of　coral　sand　and　fine　sand　were　also　affected　by　the　loading　frequency.　This　shows　that　the　loading　frequency　will　influence　in　the　shear　dilatancy　characteristics　of　saturated　sandy　soil　and　liquefaction　model.　The　flow　slip　deformation　generated　in　the　liquefaction　stage　was　closely　related　to　the　loading　frequency,　and　the　flow　slip　deformation　under　the　low-frequency　load　was　significantly　larger　than　that　under　the　high-frequency　load.　©　2021,　Editorial　Office　of　China　Civil　Engineering　Journal.　All　right　reserved.