传统可靠性设计理论认为处于工作过程中的机械零件 ,要么是安全的 ,要么是失效的。针对这个问题 ,首先从零件失效实质的角度 ,指出了它的不足 ;然后在此基础上 ,运用模糊数学的知识 ,提出了模糊可靠性设计的概念 ,并推出与其相应的数学表达式。最后给出了运用该设计方法的具体实例 Traditional reliability design theory that mechanical parts in the process of work, either safety or failure. To solve this problem, the paper first points out the shortcomings of the part from the point of view of failure of the part. Then based on this, the concept of fuzzy reliability design is put forward and the corresponding mathematical expression is put forward based on the knowledge of fuzzy mathematics. Finally, the concrete example of using this design method is given