Just like there is always a standard price (usually the issue price) at the opening of new shares? Above this price, it will rise, below this price, it will fall. Stock index futures have not been launched. Then there must be a standard to calculate the ups and downs. It also involves the problem of 10% price limit. The benchmark price is the average of the last two hours of the last trading day of the Shanghai and Shenzhen 300 Index. It's 3399 points. This is for your reference. Nothing special. In the future, the closing price of the previous trading day will be the benchmark price.