In fact, it is very simple, that is, to earn the difference between futures and spot. The bigger the price difference, the bigger the arbitrage space. The specific operation is to buy at a low price and sell at a high price, because with the expiration of the futures delivery date, the futures price and the spot price will tend to be consistent, which is equivalent to earning a part of the quantity of low-priced varieties during arbitrage, because the same amount of low-priced varieties are bought, understand?