The working principle of the spark plug: After the electric plate of the spark plug repeatedly generates electricity and ignites, it ignites the mixture in the cylinder, and other parts of the ignition system will generate high-voltage electrical pulses at the right time to form sparks and explode to provide engine power. The spark plug is a device that ignites the mixture of gasoline and air that enters the engine for combustion. It works under the harsh conditions of high temperature and high pressure and is one of the vulnerable parts of the gasoline engine. The structure of the spark plug is that a long and thin metal point half passes through a ceramic material with insulating function, and is screwed on the cylinder head by screw thread.