WM’s coordinate measuring machine are made of high-precise nature granite with stable expansion coefficient (5.2*10-6), water absorptivity (<0.2 or less), high intensity and strong rigidity(HS 85。) at the international level. Adoption of integrated granite-material guideways makes sure of stable thermal performance of themselves. The totally enclosed surrounding guideway structure makes measuring more accurate. 21 terms of compensation technique as to mechanical geometric errors improve the machine ‘s precision greatly. Three axis’s adoption of quiescent air pressure air-bearing guideway, comprised of air bearings which are self-cleaning, pre-loading and high precision, guarantees the large span of bearings, strong anti-sways, small resistance, no abrasion and stable motion. Unenclosed structure leads to various measurement configuration solutions. Therefore, measurement experience gets so flexible. Adoption of advanced F.E.M (finite element method ) makes it have a stable and reliable resistance to effective deformation.