This paper aims to predict the heating behavior of rubber samples based on finite element methods using comsol multiphysics software. The effects of frequency and dielectric parameters on the temperature distribution of the stratified and non-layered models were investigated. The dielectric parameters mainly affect the temperature of the temperature field, and the influence on the temperature field distribution is relatively small. The temperature state of the tire surface distributed by different frequencies is not exactly the same. When further studying the influence of frequency on temperature distribution, the combined frequency of 915+2450MHz is selected in the double-waveguide cavity model, and the temperature field distribution is optimal. The power selected at this time is 1000w+1000w. The average temperature of the layered model is higher than that of the non-layered model, and the temperature difference is larger. The research results can provide reference for the research of heating rubber composites in microwave heating systems.