This is the term of stock index futures. Futures contract refers to the standardized contract formulated by the futures exchange, which stipulates to deliver a certain quantity and quality of physical or financial goods at a specific time and place in the future. The CSI 500 Index represents small and medium-sized companies in Shanghai and Shenzhen stock markets. The contract market of CSI 500 index is the smallest, the most easily controlled by funds, and the operating cost is relatively low. The spot corresponding to CSI 500 stock index futures-small-market-value stocks, is also the most active stock with relatively large increase (high risk) in the previous period, and is the most representative in the market.