Firstly, the type of thermal conductive silicone film is determined according to the application of customers; secondly, the appropriate thermal conductive silicone film is selected according to the thermal conductivity, thickness, size, density, withstand voltage, service temperature and other parameters of the product. The choice of thickness is related to the gap size of the Tim position of the product that the customer needs to solve the problem of heat dissipation, and the density, hardness, compression ratio and other parameters of the Tim product itself. It is recommended that the specific parameters be determined after the sample test. The choice of thermal conductivity mainly depends on the power consumption of the heat source of the product that needs to solve the problem of heat dissipation, as well as the heat dissipation capacity of the radiator or heat dissipation structure. The best size is to cover the heat source, not the contact surface of the radiator or heat dissipation structure. When the size is larger than the heat source, the heat dissipation will not be greatly improved. When choosing the best matching gasket, at least two kinds of gaskets can be selected first, and then the thermal conductivity test can be done to decide which gasket is the best matching.