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In order to solve the problems of low efficiency of data capture, low scanning rate and low scanning accuracy of the shell, the 3D scanning system of automobile shell is designed based on Reverse Engineering technology. According to the hardware of automobile shell 3D scanning system overall structure, improve the design of the hardware part of the laser line light source, camera, data capture card and other equipment; optimization of shell scanning point the software part of the self calibration process and vehicle shell surface 3D scanning process, the reverse engineering technology of automobile shell optimization design based on 3D scanning system. The experimental results show that the system has high data capture efficiency, fast scanning speed and high scanning accuracy of shell surface.