In injection molding industry, the mold temperature plays a decisive role in the quality and injection time of injection parts. The main role is to heat or cool the mold and keep its working temperature, so as to ensure the quality of injection molded parts and optimize the processing time. It also has an impact on the production cycle, such as filling time, cooling time and spraying time to produce unstable variables. The life of the die can also cause the hot cracking of expensive steel and accelerate its aging because of the impact of overheating and overheating. Uneven or unsuitable mold temperature can cause the casting size to be unstable. During the production process, the casting will deform and cause heat stress, sticky mould, surface sag, shrinkage cavity and heat bubble. It also has an impact on the production cycle, such as filling time, cooling time and spraying time to produce unstable variables.