When designing a plastic mold, once the mold design is clear, the overall design of each part of the mold can be carried out, including the specifications of each template and part, as well as the specifications of the concave mold and core. At this point, key design parameters such as the shrinkage rate of related raw materials will be involved. Therefore, only by actually grasping the shrinkage rate of the formed plastic can the specifications of each part of the concave mold be clarified. Even if the selected mold design is appropriate, if the commonly used main parameters are not good, it is unlikely to produce plastic parts that meet quality standards.