1. margin system: in futures trading, any trader must pay a certain proportion of the value of the futures contracts he buys and sells as the fund guarantee for his performance of the futures contracts, and then he can participate in the trading of futures contracts and decide whether to add funds according to the price changes.
2. Daily debt-free settlement system: futures trading settlement is organized by the futures exchange. The futures exchange implements a daily debt-free settlement system, also known as "marking the market day by day".