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可靠性工程以突变失效问题为研究对象，已建立了一整套比较完整的理论体系，而对漂移失效引起的可靠性问题却研究得很少。但许多仪表是由性能漂移导致产品失效的。就此，本文通过对漂移失效的表现——仪表输出误差的分析，以多维随机变量的概率分布为理论依据，给出了性能可靠度的定义，建立并证明了性能可靠度的多元正态分布模型以及性能可靠度的数学表达式。
The reliability engineering has taken a complete set of theoretical system as a research object to the problem of abrupt failure. However, the reliability problem caused by drift failure has been studied very little. However, many meters fail due to performance drift. In this connection, this paper presents the definition of performance reliability through the analysis of the performance of drift failure - the output error of the instrument, and based on the probability distribution of multidimensional random variables, establishes and proves the multivariate normal distribution model of performance reliability As well as the mathematical reliability of performance.