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Impeller is key functional unit of centrifugal compressor. It is widely used in industrial and agricultural fields and often subjects to damage because of the bad work environment. Since the technology of remanufacturing the impeller has been dominated by foreign companies, domestic companies have to invest a tremendous amount of cost and time in having damaged impeller repaired. This paper is to put forward a method in an attempt to remanufacture damaged impeller based on structure characteristics. Firstly, the process of remanufacturing the damaged impeller was designed. Secondly, the point cloud data of damaged impeller was acquired; the original point cloud data were filtered and simplified reasonably to improve modeling accuracy and efficiency. Thirdly, for the undamaged area of the impeller blade, the SS, PS, LE and TE of the crosssection point cloud were automatically identified, the crosssection curve of the impeller blade was extracted and fitted based on design features; for the damaged area of the impeller blade, the boundary curve of the impeller blade crosssection was extracted and fitted using grey prediction method; the 3D digital models of impeller blade were reconstructed and the 3D model of damaged blade was obtained via Boolean operation. Finally, the 3D point cloud process platform and reconstruction experiment platform were introduced; using laser cladding forming technology and adaptive grinding, an application example of remanufactured impeller was given, which proved that the method is feasible, and the future research direction was also proposed.