To　study　the　longitudinal　vibration　characteristics　of　floating　pile　in　saturated　soil,　a　saturated　virtual　soil　pile　model　based　on　Biot＇s　theory　of　wave　propagation　was　proposed.　The　analytical　solution　for　the　displacement　of　saturated　soil　was　derived　by　the　Novak　plane　strain　method.　Then,　the　vertical　dynamic　impedance　at　the　pile　head　was　obtained　by　adopting　the　saturated　soil-pile-saturated　virtual　soil　pile　completely　compatibility　condition.　The　extensive　parametric　analysis　was　performed　to　investigate　the　effects　of　the　parameters　of　the　saturated　soil　on　the　vibration　characteristics　at　the　pile　head.　The　computational　results　show　that　when　the　thickness　of　the　saturated　soil　layer　beneath　the　pile　toe　is　4　and　6　m,　the　alternating　phenomenon　of　large　and　small　peaks　is　presented,　which　is　different　from　the　calculation　results　of　the　single-phase　virtual　soil　pile　model,　and　the　influence　of　porosity　of　saturated　soil　beneath　the　pile　toe　and　surrounding　soil　on　the　dynamic　impedance　curve　at　the　pile　head　cannot　be　ignored.　The　single-phase　virtual　soil　pile　model　of　soil　can　lead　to　considerable　errors　when　the　saturation　of　soil　layers　beneath　the　pile　toe　is　remarkable　and　the　drainage　is　poor.　The　saturated　virtual　soil　pile　model　and　the　relevant　analytical　solution　are　more　suitable　for　analyzing　the　longitudinal　vibration　characteristics　of　floating　pile.　©　2019,　Editorial　Department　of　Journal　of　Southeast　University.　All　right　reserved.