The next day's opening was caused by call auction five minutes before the opening. At this time, if the news is dull and the market has not changed, call auction will often take the settlement price of the day as the basis. If the news is dull and the futures price rises strongly at the end of the day, people often feel that the trend is strong. When call auction is in the market, the price will be slightly higher, which will lead to a slightly higher opening price the next day. So theoretically, the average closing price is an important reference index for the opening price of the next day. At the same time, the closing trend has a psychological impact on call auction investors, which can affect the opening price of the next day. The opening price will also be affected by the economic situation, the occurrence of major events, and the decline or skyrocketing of the same or related varieties abroad. In fact, what directly affects the opening price is the psychological status of call auction participants. If they think the price is higher, the opening price will be higher.