The　measurement　method　of　volumetric　errors　is　one　of　the　most　important　technologies　in　the　field　of　precision　CNC　(Computer　Numerical　Control)　processing.　None　of　the　existing　measurement　method　based　on　the　dual-frequency　laser　interferometer　give　an　accurate　and　clear　idea　alone.　This　paper　presents　the　universal　kinematics　error　modeling　of　CNC　machines　using　the　multi-body　system　and　deduced　the　relative　displacement　error　model.　By　measuring　the　component　errors　of　14　lines　in　the　specific　planes,　combining　with　the　least-squares　linear　fit　method　at　the　same　time,　all　the　21　error　parameters　can　be　calculated.　This　method　has　the　characteristics　of　universality,　solving　conveniently　and　high　precision.