The factors affecting the price of soybean meal are complex and changeable. Overall, the price of soybean meal is affected by the trend of macroeconomic environment, the main fluctuation range is affected by the relationship between supply and demand of soybean meal, and the fluctuation is restricted by surrounding related products or substitutes. In China, the main soybean producing area is Heilongjiang. Because soybean is not the staple food, unlike corn, rice and wheat, it enjoys the national protective purchasing and storage policy, and the planting area is decreasing. In 20 12, soybean exporting countries-America, Brazil and Argentina suffered from bad weather, which led to a sharp drop in soybean production. In July and August, USDA lowered its soybean production forecast for two consecutive months, and the soybean price soared, which directly affected the domestic soybean meal price in China. Since then, the price of soybean meal for pig feed in China has soared, even much higher than the price of food and flour, the staple food on people's table. For example, the price of early indica rice is only 2800 yuan per ton, and that of wheat is 2500 yuan per ton, while the price of soybean meal in the spot market has reached 4500 yuan per ton.