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In laser beam scanning manufacturing (LSM) system the PLT file was adopted as design file. The data of design file were processed by CAD software programmed. And the control model was adopted DEA control model. The DEA model was concerned with not only the distance of the two swaying mirrors, the distance between the swaying mirror and convex lens, the mirror swaying angle and the lens focal length but also the lens central height, the lens convex radius and the medium refractive index. It improved the precision and reduced the error in LBM system. The application of CAD/CAM system in LSM improved the LSM manufacturing velocity and manufacturing quality.