Due　to　the　development　of　precision　measurement　technology,　the　required　measurement　accuracy　of　the　coordinate　measurement　machine　(CMM)　is　increasingly　high.　According　to　the　method　of　laser　tracer　(LT)　multi-station　measurement,　the　spatial　coordinate　error　of　the　CMM　can　be　fast　calibrated　in　real　time　so　as　to　improve　the　positioning　accuracy　of　the　measurement　points　in　the　CMM　space.　This　study　aims　to　develop　an　uncertainty　analysis　method　for　the　CMM　spatial　coordinate　correction　system　based　on　the　multi-station　measurement　of　the　LT.　Under　the　experimental　conditions　that　the　spatial　scope　of　the　measured　points　in　the　CMM　is　300　x　200　x　300　mm(3)　,　the　number　of　the　measured　points　is　48　and　the　number　of　the　stations　of　the　LT　is　5,　the　combined　standard　uncertainty　of　the　measurement　system　is　2.2　mu　m.　At　the　same　time,　two　important　conclusions　are　drawn　and　corresponding　solutions　are　given.