Precision casting and lost wax casting, precision casting process of the key variables including mold temperature, thermal insulation properties of mold, cycle time and the methods of operating personnel, etc., however, one of the most critical process variables are metal temperature.In the precision casting process, the metal temperature has a very important properties of non-contact measurement.1, precision casting, heat treatment of the cooling is also indispensable in the process of heat treatment process steps, the cooling method in precision casting industry will varies because of casting process and heat treatment process, main is to control the cooling speed, general annealing cooling speed is the slowest, goods are cooling speed is faster, quenching cooling speed is faster.Single also have different requirements for different steel, such as empty hard steel can be hardened by normalizing the same cooling rate.