本文提出了拟纯概率法思想 ,并建立了等效威布尔分布法。由于威布尔分布可呈现多种分布形态 ,因而能克服目前在机械可靠性分析中常用的等效正态分布法的局限性 ,更合理地描述机械可靠性分析中的各类随机量 In this paper, the idea of ​​quasi-pure probability method is proposed, and the equivalent Weibull distribution method is established. Weibull distribution can present a variety of distribution patterns, which can overcome the limitations of the equivalent normal distribution method commonly used in mechanical reliability analysis, more reasonable description of the various types of random reliability in mechanical reliability analysis