Abstract: Aiming at the problem that the temperature rise characteristics of DC grounding electrodes in areas with high soil water content are unknown,this paper measures the water saturation temperature rise resistivity of different types of soils. On this basis,an electro-thermal coupled finite element model of the grounding electrode in water-saturated soil is established. A numerical example is used to compare the simulation results without considering the temperature rise effect of water-saturated soil resistivity,it is found that the temperature rise result is obviously low. With the increase of current injection time,the saturation of the electrode temperature rise curve becomes more obvious. Finally,the temperature rise test of the vertical electrode in the water-saturated soil is carried out to verify the reliability of the coupled model. The experiment and simulation results show that the calculation error can be reduced by31.84% by considering the soil temperature characteristics of the saturated water. Therefore,calculating the temperature rise of the grounding electrode in combination with the temperature characteristics of the soil resistivity of the saturated water can ensure the accuracy of the calculation to a greater extent.