Call auction adopts the principle of maximum turnover, that is, the maximum turnover can be obtained at this price. All the buying declarations higher than the price generated by call auction are sold; All sales declarations below the price generated in call auction were sold; For the purchase or sale declaration with the same price as that generated in call auction, the transaction shall be made according to the quantity of the purchase declaration and the quantity of the sale declaration, and according to the quantity declared by the minority party. If multiple prices meet the principle of maximum transaction, the opening price is the price closest to the settlement price of the previous trading day.