Taking a generator’s cover as an example,the COMET L3D three-dimensional structured light scanner system and the method of collecting point cloud data were introduced,and the main points of the point cloud data preprocessing in the Geomagic Studio software were described.The model reconstructing steps, method and the matters needing attention for the cover of generators such casting products were probed, and the error analysis was done.Finally the data model meeting accuracy requirements was obtained. Results show that by using COMET L3D three-dimensional structured light scanner for reverse engineering research aiming at casting products,innovation and improvement can be realized on the basis of absorbing the original reverse method, and the development period of new products is shortened.