Coordinate　measuring　machine　(CMM)　is　a　high　efficiency　precision　measurement　system　for　coordinate　measurement　technology.　As　the　development　of　ultra-precision　machining　technology,　the　requirement　of　the　measuring　precision　of　CMM　is　getting　higher　and　higher.　Considering　the　weak　rigid　body　state　of　CMM　in　the　process　of　measurement,　this　paper　proposes　a　CMM　spatial　coordinate　correction　method　based　on　multistation　measurement　of　laser　tracer.　Firstly,　the　laser　tracer　multistation　measurement　system　is　set　up.　Then,　the　coordinate　of　measuring　point　of　CMM　is　corrected　by　using　the　high　precision　interference　length　of　the　laser　tracer.　Finally,　the　measuring　spatial　coordinate　of　CMM　is　corrected　by　using　the　trilinear　interpolation　method.　The　simulation　experimental　results　show　that　the　average　of　the　standard　deviation　of　the　standard　sphere　diameter　obtained　by　proposed　spatial　coordinate　correction　method　is　0.098　μm,　which　is　smaller　than　0.118　μm,　the　average　of　the　standard　deviation　directly　measured　by　CMM.　The　results　verify　that　the　proposed　method　can　effectively　improve　the　spatial　coordinate　accuracy　of　CMM.　©　2017,　Chinese　Lasers　Press.　All　right　reserved.