Futures price has the function of predicting the future supply-demand relationship and its price change trend. Most futures traders are familiar with a spot market and have rich business knowledge, extensive information channels and analysis and forecasting methods. They combine their own production costs and expected profits, analyze and judge the spot supply and demand and price trends, quote their ideal prices and compete with many competitors. The futures price formed in this way actually reflects the expectations of most people, thus reflecting the changing trend of supply and demand.