In order to evaluate the reliability of products, a consistency test method of performance degradation data and fault data based on P-value is proposed. This paper introduces the process and characteristics of the consistency test method in detail, taking the performance degraded products as the object, collects the product failure and performance degradation data, determines the pseudo life of the samples and the distribution function of the failure data, calculates the p value of each pseudo life data in the distribution function, judges the consistency probability through the judgment rule, and verifies it with an example. The results show that the consistency test method ensures the validity of the performance reliability model and can provide reference for performance degradation data.