Stock index futures are a derivative financial product, also known as stock index futures, and are standardized contracts issued through futures exchanges. Its price is linked to specific stock indexes, such as SSE 50 Index futures, CSI 300 Index futures, etc. Futures trading is a high-risk financial investment, but its trading volume is large and occupies a considerable part of the global financial market.

It is difficult for some people to understand the connection between stock index futures and the stock market, but in fact they are closely related. The price of stock index futures is determined by stock price indexes, which represent the average level of the stock market. If the stock market performs poorly for a period of time, the corresponding stock index will fall, and futures prices will follow. This can lead to a vicious cycle, where a decline in the stock market prompts an increase in trading volume in stock index futures, which in turn causes a decline in the stock market.

The impact of stock index futures on the stock market is obviously not one-way. If the stock market performs well, the stock price index will rise and futures prices will rise accordingly. At this time, futures traders may reinvest profits into the stock market and drive more investment, thus driving the stock market up. This positive cycle may further strengthen investors' confidence in the stock market.

To sum up, stock index futures have an important impact on the stock market. This impact is not only reflected in stock market prices, but also in investor sentiment and confidence. There is a complex interaction between the stock market and stock index futures. Adverse changes in either market may trigger a vicious cycle between the two markets and lead to negative emotions among investors regarding market performance. Therefore, when investing in stocks and stock index futures, you must fully understand and evaluate market changes to avoid losses.