Abstract:Taking engine cylinder head and cylinder block as example, the skill of forward/reverse technology in the model reconstruction and the attention were focused on. A new method was put forward in which silicone was used to get the accurate channel and airway models, and error detection and analysis were done. Finally, the model met the accuracy requirements were gotten. The purpose of this study is to get a method which is systematic and different from traditional reverse process, this method can be used for reference to other types of products. It also can shorten the product design cycle, improve the efficiency of reverse engineering, speed up the digestion and absorption of advanced technologies.