Futures trading has the characteristics of high credit, which is embodied in the margin system of futures trading. Futures trading needs to pay a certain margin. Traders must pay a certain performance bond in accordance with the relevant regulations of the exchange before entering the futures market to start trading, and should maintain the minimum level of deposit during the trading process in order to provide guarantee for the futures contracts they buy and sell. The implementation of the margin system not only makes futures trading have the leverage principle of "taking small bets to make big ones" and attracts many traders to participate, but also makes settlement provide performance guarantee for the transactions reached and settled by the exchange and ensure that traders can perform their duties.