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The development of modern transmission has leaded to transmission gears scuffing becoming more serious. The finite element method (FEM) is proposed that can be used as the most economical and effective designing method to predict the gears temperature, determining whether the tooth scuffing or not, and analysis the thermal stress and the deformation of gears. As simulating the heat generation process of the friction in the gear engagement, the two kinds of flash temperature models are developed, which were the Block flash temperature model and the gear flash temperature model. The ISO and predicted result are compared for situations where gears engaged at different points to demonstrate the both two thermal models could calculate the gear transient temperature rise accurately. While through comparing the two models, it is found the gear flash temperature model compared to Block model, which is not only much closer to the actual gear tooth and the form of the heat load, but could superimpose gear bulk temperature model directly, so it could be more comprehensive analysis of the real temperature distribution of the gear, and solve the gear interfacial contact temperature more accurately.