Under the effect of high current,the conductivity of the cable bracket will change the magnetic field distribution around the cable,affecting the operation and leading to changes in temperature.Conventional electricity standards and regulations has not given a clear explanation of the selection cable support.In this paper,we take NanXu 220 kV substation as an example,the effects of different current carrying capacity and cable materials on the temperature rise of cable are studied by using two-dimensional electromagnetic-fluid-temperature field coupling finite element analysis method.Analysis showed that the temperature rise of cable support due to eddy currents of different materials will not endanger the safety of human and equipment,whether uses a non-magnetic material depends on eddy currents and economy.This article breaks through the limitations of traditional cable temperature calculation,taking into account the impact of cable support,given the theory and practical application foundation when selecting the material,it has important significance in improving the construction s economy and the operational reliability.