The GB/T 4207-2012 standard specifies the determination method of the electro-traceability index of solid insulating materials and the comparison electro-traceability index. The standard introduces the evaluation of the performance of insulating materials by applying voltage under specific conditions and monitoring the process of electro-traceability. This method is used to determine the tolerance of materials under the action of electric field, ensuring its safety and Reliability in electrical equipment. The standard describes in detail the test equipment, operation steps, test conditions and analysis of results. It is suitable for the electro-traceability testing of various solid insulating materials.