Stock index futures refer to financial futures contracts with stock price index as the subject matter. In specific transactions, the value of stock index futures contracts is calculated by multiplying the index points by the unit amount specified in advance. For example, the Standard & Poor's Index stipulates that each point represents US$ 250, and the Hang Seng Index in Hong Kong is HK$ 50. Generally, March, June, September and 65438+February are the cycle months of stock index contract trading, and some of them are traded every month of the year. The settlement is usually based on the closing index of the last trading day.