Plastic products account for a large proportion of the majority of machinery and equipment, from serving housework, in the family, in the office to cars, airplanes or medical equipment… Therefore, the equipment industry Plastic injection mold design and manufacturing is growing strongly and needs to focus resources to meet the increasing demand for plastic products. Plastic injection molds have the following basic detail clusters: The static mold half includes the static mold cavity, clamping plate, mold cover and expansion pins, screws, plastic channel system and cooling; The movable mold half has an additional product push system. Injection molding plastic products that meet technical requirements requires detailed design work as well as strict technical requirements. This article focuses on the design of static and dynamic mold cavities, which are parts that directly affect the size, geometric shape and surface quality of plastic products.