本文认为汽车故障率λ(t)与时间t的关系遵从典型寿命曲线—浴盆曲线所表达的关系是长期以来汽车可靠性研究中的一个理论误区,它不符合实际;同时提出并分析了汽车故障率的离散性及其特点、用曲线簇来表示这种离散特点的新观点,以及这一观点的实际应用价值。 This paper argues that the relationship between car failure rate λ (t) and time t follows a typical life curve - the relation expressed by the bathtub curve is a theoretical misunderstanding in the long-term automotive reliability study, which is not in conformity with the actual situation. Meanwhile, Rate of discreteness and its characteristics, the curve cluster to represent the new features of this discrete point of view, as well as the practical value of this point of view.