Measure high-speed development of technology with computer and automation, reverse project become research object of regarding material object as already, utilize computer technology to carry on the technological means of product image and new product development. Reverse engineering has already been combined with advanced manufacturing technologies such as CAD/CAM ,etc. at present, develop into a relatively independent research field in CAD/ CAM system. Apply reverse project to note mould design , it is the note that moulds a new developing direction designed. It regards moulding an entity as the research object, utilizes advanced measurement technology and asks the software to reconstruct the curved surface instead , carry on the product design on the basis of curved surface . This plants plastic products with complicated curved surface of adaptation that design method can be flexible , the great one has met the demands for the appearance of the products besides product structure of people. This text take outer cover of clock as an example, introduce reverse project application and note of mold design mould the procedure of designing mainly. Measure some cloud data of material object through 3 coordinate non- contact-type laser detectors, utilize advanced Pro/E three-dimension to design the software , reconstructs the curved surface to some clouds that are measured. On the basis of reconstructing the curved surface , design product structure. According to the injection mould that the structural design of the products is corresponding. 自己翻的,,翻了好长时间