Eccentric　shaft　follow-up　grinder　is　the　core　equipment　in　the　process　chain　of　eccentric　shaft　machining.　In　the　process　of　grinding,　the　establishment　of　the　kinematic　model　and　the　determination　of　the　kinematic　relationship　of　the　C-X　axis　follow-up　grinding　directly　affect　the　quality　of　the　grinding　process,　and　there　are　many　error　factors　in　the　grinding　process.　It　is　very　important　to　analyze　the　influence　law　of　these　factors　on　the　quality　of　the　workpiece.　Through　the　mechanism　of　the　error　in　the　process　of　machining,　which　is　caused　by　the　change　of　X　coordinate　position,　head　frame　rotation　and　wheel　center　eccentricity,　the　geometric　relationship　is　established　to　solve　the　problem.　The　MATLAB　simulation　is　carried　out　to　find　out　the　source　of　the　error,　so　as　to　lay　the　foundation　for　the　subsequent　error　compensation　and　achieve　the　purpose　of　improving　the　machining　accuracy.　©　Published　under　licence　by　IOP　Publishing　Ltd.