The control of the surface temperature of die casting die is very important for the production of high quality die castings. Uneven or improper mold temperature will also lead to the casting size instability, in the production process of casting deformation, heat pressure, viscosity, surface sag, internal shrinkage and hot bubbles and other defects, the mold temperature difference is large, the production cycle of the variables, such as filling time, cooling time and spraying time have different degrees of influence.