The futures market refers to the futures market. The futures market is a market for buying and selling futures contracts. This kind of transaction is participated by producers and operators who transfer the risk of price fluctuation and investors who bear the price risk, and is guaranteed by various related systems such as margin system. The transaction is conducted in fair competition within the exchange according to law. A notable feature of the margin system is that it makes bigger transactions with less money. The deposit is generally 5- 15% of the contract amount. Compared with spot trading and stock investment, investors put much less money into the futures market than other investments, commonly known as "small bets". The purpose of futures trading is not to obtain physical objects, but to avoid price risks or arbitrage, and generally does not realize the transfer of commodity ownership. The basic function of the futures market is to provide producers and operators with a means of hedging and avoiding price risks, and to form a fair price through fair and open competition.