设Ａ是一个指数寿命型元件，设其寿命服从参数为λ的指数分布，λ＞０，λ未知．本文研究基于该元件的一次性检测数据及分组数据，用样本点排序法计算元件失效率λ的经典精确最优置信上限，并证明了所得置信上限的最优性．

Let A be an exponential-span type component and the span satisfy exponential distribution Eλ, here parameter λ is unknown.In this paper, we obtain the classical exact optimal upper confidence limits of failure rate λ using the ordering method of sample points based on the group data and binomial data. Morever we proye the optimality of our results.