MQ series adoption of F.E.M (finite element method) guarantees its strong quality steel in mechanical configuration, small geometrical error, high measuring efficiency, high precision and high stability of CMM In overall configuration, the adoption of quality steel and lightweight air-bearing gantry with mobile bridge-shaped support guarantee its conciseness, compact design, heavy load and excellent performance in motion. Granite fixed worktable ensures strong heavy load, expanse and simplicity for assemble and unassemble. Adoption of coattail pattern for Y-axis directional guideway guarantees the high precision in positioning and stable excellence in function. Three-axis's adoption of quality granite guarantees small coefficient in thermal expansion and uniform temperature specialty so that it serves to excellent stability in temperature, good anti-transmogrification, high quality steel and small geometrical error in motion. 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. Crossbeam's adoption of precise designing technology of inclined girder (patent) guarantees the machine's light weight, low center of gravity, strong quality steel and small error in motion so that the stability of the machine is strengthened. The adoption of Britain RENISHAW'S metrology system, which is reflective, metal-coiled and grating ruler similar to the majority of workpieces in coefficient of thermal expansion, guarantees the favorable precision of repeatability. The drive system's adoption of international famous DC servo motor and dentiform-strap gearing mounting guarantees higher efficiency in gearing, higher precision and higher performance in motion. Z-axis's adoption of balancing mounting of air cylinder raises the orientation precision and stability by a large degree. The control system's adoption of the exclusive SB system, which is the well-known coordinate data control system in Germany, and the advanced dual computer control systems with the pattern of up-down computers strengthen the system's