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.

After the opening of CICC, competitive transactions were adopted. When the price limit is entrusted to bid, the computer automatic matching system sorts the trading declarations according to the principle of "price first, time first". When the buying price is greater than or equal to the selling price, the matching transaction price is equal to the middle value of the buying price (bp), the selling price (sp) and the previous transaction price (cp).

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