This paper have introduced the key surface treatment technology of titanium alloy wheel gear on the manufacturing process. In view of the mechanics characteristic of titanium alloy wheel gear during the process of operation,as well as the microstructure of the hydrogen-free carburizing coating,the TiC and Ti diffusion layers on the surface of titanium alloy have improved the abrasive resistance and increased the shock resistance of tooth surface. Under the effective coordination of hydrogen-free carburizing,heat treatment and mechanical manufacture,the titanium alloy wheel gear exhibits a very good abrasive resistance,shock resistance,low noise,and has smooth running for 16 years.