The service condition of diesel injector nozzle is introduced, the failure reasons of diesel injector nozzle are mainly 摘要介绍了喷油嘴偶件的服役条件，分析了喷油嘴偶件失效的原因，对提高喷油嘴偶件质量和延长喷油嘴偶件使用寿命的途径进行了探讨。