according to relevant estimates, the annual demand for large and medium horsepower tractors is about 100000, and the number of combine harvesters is 50000. In addition, the ownership of various agricultural machinery is also increasing. It is estimated that by 2010, there will be about 1.3 million large and medium horsepower tractors and about 400000 combine harvesters. Bearing products for agricultural machinery OEM matching accounted for a large proportion. Therefore, the market demand of hydraulic and pneumatic seals for agricultural machinery matching and maintenance will be greatly increased. Agricultural machinery products need a large number of cylindrical roller bearings, ball bearings, needle bearings and so on.