Futures refers to a standardized agreement to trade stock indexes at a predetermined price in the future. The risk types of stock index futures are complex, and the common ones are: legal risk. If an investor in stock index futures chooses a futures company that does not have legal futures brokerage business qualifications to engage in stock index futures trading, its rights and interests are not protected by law; Or the selected futures company has illegal business practices in the trading process, which may also bring losses to investors. Market risk. Due to the leverage of margin trading, when there is an unfavorable market, a slight change in the stock price index may cause great losses to investors' rights and interests; When the price fluctuates violently, investors will even be forced to close their positions because of insufficient funds, which will make the principal loss exhausted, so investors will face greater market risks when trading stock index futures.