GB/T 2423.50-2025 "Environmental testing - Part 2: Test methods - Test Cy: Damp heat, steady state, primarily intended for accelerated testing of components" applies to accelerated damp heat environmental adaptability testing for electrical and electronic product components and is equivalent to the relevant international standard. It specifies the test method under constant temperature and humidity conditions, defines core parameters such as temperature and humidity control accuracy and test duration, and achieves rapid aging assessment by intensifying the damp heat environment. It covers requirements for sample pre-treatment, test process control, and result evaluation. It is suitable for assessing the performance stability of components in high-temperature and high-humidity environments, providing a unified basis for component selection, design optimization, and quality control, thereby ensuring the reliable service of products in damp heat environments.