Gear transmission is the most widely used transmission form in mechanical transmission. Xk2116 CNC vertical milling and boring machine is one of the classic products of Wuzhong group. Its main axle box has complex internal structure and many gears. Since the appearance of machine tool, the failure rate caused by gear is very low, so it can be seen that the gear design is reasonable and the material and heat treatment process are properly selected. This paper introduces the main moving gear material and heat treatment process.