Miniature tractors are the most widely used agricultural power machinery in the vast rural areas and are responsible for a large number of production tasks such as farmland cultivation and rural transportation. So, how should farmers choose small tractors? First of all, we must pay attention to the collection and understanding of the situation of various manufacturers, such as the factory's reputation, product quality is stable or not, how after-sales service and so on. Second, we must pay attention to the availability of spare parts for purchased models and whether it is convenient to purchase. If accessories are not readily available, on the one hand affecting production, and on the other hand increasing maintenance costs, it may even happen that a part costs several times or several times more than the price of the part itself. Again, pay attention to the completeness and performance reliability of supporting farm tools. Tractors must have farm tools to work with. The supporting conditions and performance of agricultural tools have a great influence on the normal production and productivity improvement. After the tractor leaves the factory, it must go through transportation and loading and unloading. Sometimes the external parts may be deformed or damaged due to extrusion or impact, or they may be lost. Therefore, at the time of purchase, it is necessary to go through technical appraisal to determine the purchase. The appraisal is generally divided into external form identification and operation status appraisal.