With China's industries continue to develop and die industry is also becoming increasingly important, the proportion of plastic mold is also growing. The design of the liner injection mold design, parts of the structure analysis for the process. According to parts of the structure and production volume and precision parts, select a mode of a cavity-mode standard, single-face and The system is pouring from the plastic parts of the central ring to the side pouring Department, the mainstream mold Road from the Central Pavilion, Road diversion moving on the core model. Choose the injection machine, computing the size of the molding parts. Under the parts used in the molding characteristics, the right mold cooling pipes for cooling. As part of a relatively small size, use of die out the top bar and head out of the hole with Gap, from the top block and core template and the other with space to exhaust. The adoption of side gate. Direct use of derivative-oriented, putting the material. As the core pulling shorter distances, in order to enable Die simple structure, using bevel-side core-pulling, also mold the material of choice. The design of such a structure can be used to ensure reliable die. Finally, the injection mold structure and the matching machine was calibrated.