Abstract: In order to study the influence of carburizing temperature on the distribution of carbon content and the thickness of carburized layer of gear ring, the mathematical model of carburizing and quenching of 20CrMnTi material was determined firstly, and then the model of carburizing and quenching material was established by introducing Deform-3D software. Based on this, a finite element model of carburizing and quenching at 850, 870, 890, 910 and 930℃ for 1/2 single teeth of this material was established according to the heat treatment scheme of carburizing and quenching. The carburizing and quenching process was simulated, and the carbon content and thickness distribution of carburizing layer were analyzed at different carburizing temperatures. The results show that the carbon content and thickness distribution of carburizing layer are consistent at different carburizing temperatures. The carbon content and carburizing layer thickness along the tooth top, the indexing circle and the tooth root decrease gradually. With the increase of carburizing temperature, the surface carbon content and carburizing layer thickness of the gear tooth increase continuously.