The imbalance between soybean supply and demand in the market often leads to the "yangge" of soybean price, which is a common phenomenon in the agricultural product market. Yangko swings too much, not only because of the imbalance between domestic soybean supply and demand. After China's accession to the World Trade Organization (WTO), the domestic soybean market has been liberalized, and the market price fluctuation caused by the imbalance between supply and demand in the international soybean market will also "infect" the domestic market and aggravate the fluctuation range of soybean prices in China. For example, in recent years, some countries have used soybean oil to produce biodiesel in order to reduce their dependence on oil, which has led to the imbalance between supply and demand in the market and triggered fluctuations in the soybean market. The speculation of some speculators in soybean futures market and the strategic "arrangement" of grain processing enterprises will amplify the actual relationship between supply and demand in the market and trigger drastic fluctuations in soybean prices. China's soybean industry lacks long-term support policies, and the unstable soybean output is also one of the reasons for the fluctuation of soybean prices.