The　main　components　of　the　opposed　biconinal　cone　screw　high-pressure　seawater　hydraulic　pump　is　the　rubber　bush　and　metal　cone　screw,　and　the　interaction　of　the　bush　and　cone　screw　is　one　of　the　main　factors　affecting　the　novel　pump　performance.　The　deformation　and　stress　of　the　bush　and　cone　screw　under　the　initial　interference　is　analyzed　by　the　nonlinear　finite　element　analysis.　The　analysis　shows　that:　under　the　effect　of　the　initial　interference,　large　displacement　is　present　to　the　radial　surface　of　the　cone　screw,　and　the　displacement　of　the　radial　surface　mainly　affects　the　displacement　vector　sum　of　the　cone　screw,　and　the　deformation　decreases　gradually　from　the　middle　to　the　ends　of　the　cone　screw,　while　the　cone　screw　is　bending;　the　deformation　in　three　direction　of　the　bush　is　close　to　each　other,　but　the　location　of　the　maximum　displacement　in　each　direction　is　different;　with　the　shrink　range　increasing,　the　deformation　of　the　cone　screw　and　bush　increases,　but　the　deformation　of　the　cone　screw　is　much　smaller　than　that　of　bush,　so　the　deformation　of　the　bush　mainly　affects　the　seal　between　the　cone　screw　and　bush,　and　the　shrink　range　between　the　cone　screw　and　bush　decreases　because　of　the　deformation　of　the　bush.　Over　the　role　of　the　interference　force,　the　maximum　von　mises　stress　of　the　cone　screw　is　an　order　larger　than　that　of　bush,　and　the　maximum　von　mises　stress　both　increases　with　the　shrink　range　increasing;　although　shrink　range　is　different,　the　location　of　the　maximum　von　mises　about　the　cone　screw　and　bush　is　the　same.　©　(2012)　Trans　Tech　Publications,　Switzerland.