Based on characteristic of autobody panel, data processing and reconstructing curved surface are described in detail by the example of autobody panels making. The points cloud is obtained by laser three-dimensional scanner, and is treated by surface software. Autobody reconstructing surfaces is achieved by reverse engineering. Finished surface model is made out of wax and processed in CNC milling machine. In paper, it presents the method that reversal design is linked directly to CNC milling machine to finish complex curved surface machining. The result shows the method is the means of developing new car quickly and improving automobile type.