GB/Z 21223.3 - 2023 is the third part of the series of guidelines for statistical analysis of aging test data. This part focuses on determining the minimum number of samples under different test conditions based on given test data. It elaborates the process of calculating the minimum number of samples through scientific statistical methods, taking into account factors such as data dispersion and confidence level. This provides key guidance for the planning of aging trials, helps researchers and enterprises to rationally arrange test resources, and effectively reduces test costs and improves the efficiency and scientificity of aging trials while ensuring the Reliability of test results.