I want to focus on the impact of stock index futures. Please note that stock index futures open 15 minutes earlier than A shares and close 15 minutes later than A shares. Therefore, it is suggested that friends who make stocks pay attention to the trend of stock index futures 15 minutes in advance. The trend of stock index futures before 15 minutes has a great influence on the opening price of A shares. After the closing of A shares, continue to observe the stock index futures 15 minutes. During this period, the strength of stock index futures also had a great impact on the opening of A shares the next day. In addition, from the statistical data of foreign stock index futures, at the beginning of listing, the stock market rose in the short term and fell in the medium term, which conforms to the basic trend in the long term.