Abstract: This paper mainly focused on the basic process and implementation approach of train parts model reconstruction, and demonstrated the basic working process of the reverse reconstruction of train parts. It was chose hardware and software tools according to the characteristics of the train parts reverse reconstruction, described the main process of train parts surface reconstruction and concrete realization with Catia V5R19. This paper also put forward some suggestions for the project implementation process, supplied reference opinions for the reverse engineering technology and other related industries.