Abstract:Based on gasoline engine of the cylinder block and cylinder head as an example, the application of Handyscan Three Dimensional (3D) laser scanner to get point cloud data, and combining with the relevant processing software of reverse engineering detailed research of point cloud data pretreatment, model reconstruction, error detection, and optimization of the key steps and matters needing attention is carried out. Finally the accurate modeling of this typical structure product was realized. Research result can provide technical support for other types of similar products in reverse research, make foreign advanced design experience combined with our existing design system, and is beneficial to accelerate the development of core technology.