Heat sink is a kind of heat dissipation device which is easy to heat down electronic components in electrical appliances. Most of them are made of aluminum alloy, brass or bronze, sheet shape, multi-sheet and so on. In general, the heat sink should be coated with heat conduction silicone grease on the contact surface between the electronic element and the heat sink, so that the heat emitted by the components can be transmitted to the heat sink more effectively and then distributed into the surrounding air through the heat sink.