Interference　fit　is　widely　uesd　in　micro　gas　turbine　to　transfer　large　torque　and　offer　significant　cost　advantages.　In　this　paper,　a　interference　fit　model　was　developed　to　research　the　contection　characteristics　of　quill　shaft　for　micro　gas　turbine.　The　radial　stress,　tangential　stress,　radial　displacement　and　the　Von　Mises　stress　of　the　quill　shaft　are　derived　by　using　elastic　theory　to　analyze　the　influence　of　the　contact　surface　pressure　and　angular　velocity　on　the　strength　of　the　quill　shaft.　Numerical　calculated　results　show　that　The　radial　stress　of　the　quill　shaft　is　identically　greater　than　zero　and　positively　correlated　with　the　contact　press　and　angular　velocity.　The　direction　of　the　tangential　stress　of　the　quill　shaft　is　determined　by　the　value　of　the　contact　pressure.　The　radial　displacement　of　the　quill　shaft　is　a　monotony　decrease　function　of　the　contact　pressure　and　a　monotony　increase　function　of　the　angular　velocity.　Generally,　the　maximum　stress　of　the　quill　shaft　happens　in　the　inner　surface　of　the　quill　shaft　regardless　of　the　angular　velocity.　©　Published　under　licence　by　IOP　Publishing　Ltd.