Tractor is a self-propelled power machine used to draw and drive working machinery to complete various mobile operations. It can also be used for fixed operation power. It consists of systems or devices such as engine, transmission, walking, steering, hydraulic suspension, power output, electrical instrumentation, driving control and traction. The power of the engine is transmitted to the drive wheels by the transmission system to make the tractor drive. In real life, it is common to use a rubber belt as a medium for power transmission. Tractors are divided into agriculture, industry and special uses by function and use; wheeled, crawler, boat-shaped tractors and self-propelled chassis are divided by structure type.