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Spark plugs, its role is to lead the high-pressure high-voltage discharge pulses sent by the breakdown of air between two electrodes spark plugs, spark ignition as the gas mixture inside the cylinder. The basic conditions for high-performance engine: the spark of high-energy stable, mixed homogeneous mixture, high compression ratio. When cylinder in working, mixed gas compression, high combustion temperature and pressure, so that spark plug temperatures up to 900 °C, at this time but also the spark plug ignition, high temperature electrode can imagine. As silver, gold melting point is too low it can not be used as electrode materials Division, while nickel is close to the melting point of 1500 °C and the price is cheap, they were widely used. Platinum is close to 2000 °C was only melt away, its stability and resistance to natural erosion better than nickel. The newly emerging Iridium material is higher than the melting point of platinum, so more suitable for high-performance engine for a long time, high-speed situations.