The standard guide provides guidance on the application of basic statistical methods in natural aging trials. These statistical methods help to improve the validity of experimental results, supporting decision-making through sound experimental design and data analysis. The guide is applicable to the analysis of natural and laboratory efflorescences data, emphasizing how to deal with uncertainties caused by exposure variation, measurement errors, and material differences. Although the guide only deals with basic statistical methods, it is important for interpreting weathering test results and determining the applicability of test methods. Users need to have some basic knowledge of statistics and apply these methods in conjunction with practical problems.