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This article describes the general method of surface reverse engineering design based on some cad software such as UG and Imageware through the example of Santana's front door panel reversal design. After obtaining the cloud points data by using the software Tritop and Atos and Utilizing the Freeform model in UG, curved net map of feature lines and curved surface are created according to the point clouds which is obtained with CCD Camera. The author also summarizes several methods of A-class surface quality evaluation by analyzing surface quality of the front door panel and finally analyses and checks the craft of the door. With the rapid development of the modern automotive industry, the modern automotive body design method based on CAX will be largely applied to body design.