The service life of the grounding resistance cabinet is determined by the material it is made of. There are two kinds of materials for manufacturing the grounding resistance cabinet: metal material and insulating material. Metal materials are resistant to high temperature, while insulating materials will gradually lose their original mechanical and insulating properties under the action of high temperature, electric field and magnetic field for a long time, such as brittle, mechanical strength weakening and electric breakdown. This gradual process is the aging of insulation materials. The higher the temperature, the faster the mechanical properties and insulation properties of insulation materials weaken; the more moisture content of insulating materials, the faster aging. The insulation materials in the grounding resistance cabinet should bear the load generated by the operation of the grounding resistance cabinet and the effect of the surrounding environment. The sum, strength and action time of these loads determine the service life of the insulation materials.