In today's era, has become a mold forming an important means of industrial production. Die injection mold is used in the production of the most common methods, with good quality and low cost advantages of a series. In this paper, plastic injection mold design the method of forming the mold of the quality of plastic parts, and then stripping the mold, cooling system, core, core-pulling, and die-oriented institutions such as the design. The design of the biggest advantages is economical and practical. In the manufacturing sector growing internationalization of the circumstances, the automobile manufacturing industry has been an unprecedented development, at the same time, plastic injection mold the application of more and more widely. Has been used in aerospace, shipbuilding, electronics, industrial design, industrial production and other fields, have played an important irreplaceable role. In this paper, plastic parts of the structure and use of computer software painted plastic parts of the model, then select a material, injection molding machine selection, the punch die design, die design, cooling systems, core-pulling, oriented institutions, etc. A series of design, in addition to the other parts of plastic injection mould for a simple design. Finally on the design after the completion of this experience, and after the die design ideas put forward their views and opinions.