In the futures market, traders only need to pay a small amount of money according to a certain proportion of the price of futures contracts as a guarantee for the performance of futures contracts, and they can participate in trading by virtue of futures contracts. This kind of money is the futures margin.

In China, futures margin (hereinafter referred to as margin) can be divided into settlement reserve and trading margin according to its nature and function. Settlement reserve is generally paid by the unit to the exchange according to a fixed standard, which is prepared in advance for transaction settlement. Trading margin refers to the actual margin paid by member companies or customers for holding futures contracts in futures trading, which is divided into initial margin and additional margin.