This essay,by analysising two failure cases of pisto n of high-specific power engine used in north china in winter,investigates reasons for piston failure,and also presents some anti-failure measures.

• 通过对两例高比功率柴油机冬季在北方地区使用中活塞失效实例的分析，找出产生活塞失效的原因，并提出避免这种失效应采取的措施。