Stock index futures are the earliest varieties of financial futures. The earliest financial futures product is the stock index futures introduced by Chicago Mercantile Exchange 1972, also known as "Standard & Poor's 500 Index Futures", which is a futures contract with the Standard & Poor's 500 Index as the subject matter. Financial futures refers to futures contracts with financial assets (such as stocks, bonds, currencies, etc.) as the target. ) is the theme. The Standard & Poor's 500 Index is a stock market index, which contains the stocks of 500 leading listed companies in the United States and is an important indicator reflecting the overall situation of the American stock market.