Heat sink is a kind of heat dissipation device for heat dissipation of electronic components in electrical appliances, mostly made of aluminum alloy, brass or bronze into plates, sheets, multi-sheets, etc., such as the CPU CPU in the computer to use a considerable heat sink, the power tube in the TV, the line tube, the power amplifier tube in the power amplifier to use the heat sink. Generally, the heat sink should be coated with a layer of thermal grease on the contact surface between the electronic components and the heat sink in use, so that the heat emitted by the components is more effectively conducted to the heat sink, and then dissipated into the surrounding air through the heat sink.