The opening price is 9.00 five minutes before the market opens. The first four minutes in call auction are the time for futures contracts to be declared, and the next minute is the time for call auction to match. The opening price will be generated at the opening of the market.

Similarly, the closing price is 5 minutes before the market closes, 4 minutes before the bid-ask price order of the futures contract, and 1 minute after the declaration time. When the call auction is closed all the time, the closing price can be generated.

Call auction adopts the principle of maximum transaction, where the price is higher than the buy declaration generated by call auction, and the price is lower than the sell declaration generated by call auction, which is equal to the buy or sell declaration in call auction.

The trading system automatically controls the start and end of call auction declaration and displays it on the computer terminal.