Abstract: The 3D scanning measurement data have the problems including bigger density of the point clouds, much complicated operation and longer calculation period caused by inevitable noise points, flying spots, overlapping point clouds restricted by environment and other objective conditions, when the original point clouds are obtained. The 3D optical scanning technology in reverse engineering has the function for changing 3D solid information into digital signal that a computer can be directly handled, providing convenient and fast means of real digital model.Based on this, that main equipment, the commonly-used software, using method and solid modeling software related to 3D scanning technology were studied,as well as the basic theory and math model of 3D optical scanning technology. Scanning strategy was formulated combined with XJTUOM. Moreover,a certain type of belt wheel and shock absorber tray were taken as examples to prove the applicability of 3D scanning technology in reverse engineering practice. Results show that the scanning similarity accuracy is 98% close to original model.