The　focus　of　this　paper　is　to　find　a　new　method　analyzing　the　reasons　of　CNC　machine　tool　precision　recession.　The　modeling　of　the　movement　error　of　CNC　machine　tool　is　one　of　the　most　important　problem　for　kinematics　designing　and　accuracy　analysis.　In　this　dissertation,　this　study　analyzes　the　six　movement　error　parameters　of　guide　and　the　model　of　the　guide　which　including　foundation　deformation,　material＇s　natural　ageing　and　way　rub　has　been　established.　A　detailed　example　is　given　for　the　modeling　precision　recession　of　3-axis　CNC　machine　tool.