For most peasants, the purchase of a rice combine harvester is an investment activity that seeks to earn a substantial income by working for others. Therefore, it must be carefully selected at the time of purchase. At present, there are many brands of rice combine harvesters sold on the market. Then, when farmers' friends buy a combine harvester, what aspects should they consider? (1) The choice of mechanical size. Rice combine harvesters generally have a power of 9 to 107 kilowatts. Therefore, the size of the selected model should be compatible with the size of the plot and the condition of concentrating. If the plots are flat, the plots are large and the height difference is small, larger models should be selected; if the plots are small and scattered, small harvesters should be selected. If small plots are used in small plots, the efficiency of the harvester cannot be fully realized; small plot harvesters used in Daejeon blocks have low productivity and cannot meet the requirements for fast harvest in busy season. (2) Selection of harvester feeding method. According to different feeding methods, the rice combine harvester is divided into half feeding and full feeding models. The fundamental difference between the two is that the rice straw is treated differently. In the half-feeding human model, when threshing rice, only the spikes enter the threshing device, and the straw is basically kept intact. This kind of model has a low cutting rate of 6 to 10 cm. The straw transportation device of this model is more complex and the price is higher, but in recent years, it has developed rapidly in the coastal areas such as Jiangsu, Shanghai, Zhejiang, and Guangdong. The current market has a tendency of further expansion, and it is ready to purchase half-fed people and jointly harvested. There will be more and more people of machine products. The foreign products are mainly in Japan and South Korea, and there are domestic models such as the Wuxi Joint Harvester Factory, the Huzhou Joint Harvester Factory, the China Agricultural Machinery Institute, Beiqi Futian, and Changchai. All feeding models, straw and ears were all fed with a threshing device. After being struck by a roller, the straw was broken up and mixed into a mess and discharged into the field. In order to reduce the load on the threshing cylinder, the cuttings are generally kept at a height of 10 to 20 cm. The model is simple in structure and relatively low in price. After many years of production and use, the domestically-produced tracked rice combine harvester has greatly improved its performance, structure and product quality, and has become a relatively low-cost investment target for many farmers. There are also many manufacturers and product types of such models, such as Sanlian, Liulin in Taizhou, Bilang, Xingguang in Huzhou, Fengling in Taizhou in Jiangsu, and Gushen in Futian. (3) Selection of walking device. There are two kinds of walking devices for the rice combine harvester: wheeled and rubber crawler. The wheeled walking device has a mature structure and wide versatility. However, the tire has a small ground contact area. When operating in paddy fields, it has a deeper sink and is difficult to turn and walk. At the same time, it has serious soil damage to the field surface. It is suitable for relatively dry and hard soil. Used in depressed areas. Tracked harvesting equipment has a large crawler ground contact area, a shallow depth of settlement during operation, and normal paddy fields can be operated normally. Therefore, buyers should choose harvesting machinery according to the local paddy soil properties and production habits. For sandy and semi-sand soils with strong bearing capacity, wheeled walking gear harvesting machines can be used. For viscous, semi-viscous soils, it is appropriate to use a harvester model with a crawler-type walking device. In addition, the wheel-type walking device of the backpack-type harvesting machine can be used to remove the harvesting equipment when the farmer is idle, and the tractor can be engaged in transportation operations; when the farmer is busy, the farmer can also be equipped with a plow, pickaxe or rotary cultivator. The host uses more than one machine, high utilization rate and good economic benefits. The harvester of tracked walking devices is a dedicated harvesting machine with low utilization rate. When purchasing, purchasers should also carefully consider. (4) Selection of harvesting methods. Rice combines harvester, threshing, and cleaning, and several processes are completed at one time. The degree of mechanization is high, and the grain after cutting is basically clean, generally should be given priority. Some regions are affected by economic conditions and traditional harvesting methods. They have long been accustomed to harvesting first, drying and then threshing, and they may consider choosing a rice windrower. (5) Choose a mature rice combine harvester. It is advisable to purchase the models introduced by the local agricultural machinery promotion department, and after local trials and demonstrations to prove that the quality and performance are reliable and suitable for local use models. At the same time, we must pay attention to the brand reputation of the model and the after-sales service capabilities of the production companies. Do not buy rice combine harvesters with poor quality and unsatisfied after-sales service. Each type of rice combine harvester has a lot of brands. In addition to selecting the corresponding models based on local characteristics and actual conditions, the purchasers should also pay attention to the following points. (1) Market performance of products. No matter what kind of product you buy, first of all it works. Currently, in the semi-feeding combine harvester marketed on the market, from the aspect of product quality, market sales, etc., foreign Kubota and Yanmar people are the first, and some domestic brands perform well. In general, the quality of imported products is better than domestic products, but with the maturity of domestic product technology, the market has become more and more important, forcing foreign products to accelerate the pace of localization, simplifying the technology, using a large number of domestically produced parts, reducing prices, and the quality gap. Gradually closer. (2) Your own investment ability. Half-feeder combine harvester is a one-time investment of larger products. Domestic machines are generally lower than 150,000 yuan, and foreign products are about 200,000 yuan. The total price of the domestically-produced tracked rice combine harvester is around 40000 yuan, and the relative investment is less, but the service life is low, especially the maintenance cost is higher in the later period of use. When buying a half-feeder combine harvester, not only must you weigh how much money you have in your own pocketbook, but also how much you put into the output and related costs. You cannot buy products that have poor product quality and are not profitable because you save money. (3) Use and maintenance costs of the product. Any product requires not only one-time investment at the time of purchase, but also continuous maintenance and investment during use. Therefore, before selecting a product, be sure to clarify the after-sales service of the manufacturer, the supply of accessories, and the price of accessories. Choose a product with good after-sales service, timely and convenient supply of accessories, and reasonable prices. (4) Harvester harvests market conditions. Buying back the combine harvester must also consider the recovery of funds, which is to understand the market conditions. At the beginning, the half-feeder combine harvesters in Jiangnan and Shanghai were once harvested at prices as high as 100~140 yuan/mu. In recent years, the harvest price has decreased due to the increase in the amount of holdings, which means that the harvest time of the combine harvester To extend