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with the vehicle to the large-scale, the development trend of high speed, the normal running of the vehicle braking energy increases, the conventional friction brakes have been difficult to meet the use requirements, it is likely to cause some trouble. Eddy current retarder as non contact without friction, short response time, no time delay, when the noise is very small, can provide the normal running of the vehicle 85% brake power has become a vehicle auxiliary braking system model. This paper uses the ANSYS software implementation of eddy current retarder rotor plate two-dimensional temperature field analysis, establish the rotor disc model, and then temperature modeling field control system based on different loads and constraints. Finally, this paper made a large number of simulation experiments, simulation of the braking torque according to different, different magnetic circuit structure and the rotor disk temperature analysis of automobile brake performance.