Introduction In 2005,the world had 800 million cars.China had 33,56 million,3-4 cars in every 100 people,and the world average was one car in every eight people,while the United States one car per person. In China,the development of agricultural automobile is also very fast,annual production and sales of more than 300 million. 1.2 The overview of tractor development In 1959,the first tractor factory was built in China-Luoyang First Tractor Factory,which started to produce Eastemn Red tractor.Since then the country had built a number of tractor plants and diesel engine plants,which produced various types of tractors and diesel engines. At present,our country holds more than 16 million tractors,of which more than 1 million units in large and medium tractors,annual tractor output of 200 million units.Type and model range. Due to the different national conditions from other nations,China's production of tractors are mainly in small and medium-based during over 40 years,a smaller Northwest A&F University 机械对电子工程擦 Automobile and TractorAutomobile and Tractor Northwest A&F University Introduction In 2005, the world had 800 million cars. China had 33,56 million, 3-4 cars in every 100 people, and the world average was one car in every eight people, while the United States one car per person. In China, the development of agricultural automobile is also very fast , annual production and sales of more than 300 million. 1.2 The overview of tractor development In 1959, the first tractor factory was built in China - Luoyang First Tractor Factory, which started to produce Eastern Red tractor. Since then the country had built a number of tractor plants and diesel engine plants, which produced various types of tractors and diesel engines. At present, our country holds more than 16 million tractors , of which more than 1 million units in large and medium tractors, annual tractor output of 200 million units. Type and model range. Due to the different national conditions from other nations, China's production of tractors are mainly in small and medium-based during over 40 years, a smaller