GB/T 11026.10-2019, issued in June 2019 and implemented in January 2020, is a crucial standard for evaluating the thermal endurance of electrical insulating materials. Its core methodology is based on activation energy calculation, which accelerates the determination of the relative thermal endurance index (RTEA) by analyzing test methods, thereby addressing the long duration issues associated with traditional long-term aging tests. This standard is applicable to insulating materials with a single dominant aging reaction. By combining activation energy obtained from thermal analysis with conventional thermal aging lifetime data, it enables rapid and accurate assessment. This method reduces the testing period from several months to just a few days, providing a scientific basis for material development and screening, as well as quality control of electrical equipment. It widely supports the application of insulating materials in fields such as new energy and high-end equipment.