GB/T 21223.2-2015 "Guidelines for Statistical Analysis of Aging Test Data, Part 2: Validation Procedures for Statistical Analysis of Censored Normal Distribution Data" specifies the procedures for statistical analysis of censored normal distribution data. The standard describes in detail how to design, determine and verify censored data sets, providing a similar analysis method to that of uncensored data sets. The standard places special emphasis on the influence of data set size and degree of censored data on the results, providing a reliable statistical tool for the analysis of aging test data. It is widely used in aging data analysis in fields such as electrical insulation materials.