Call auction can of course cancel the order, which is the most basic right of traders. If the bidding ends and the matching transaction starts (between 8: 59 and 9: 00), the order cannot be withdrawn (of course, the withdrawal cannot be suspended at this time), and the order can only be withdrawn after the opening.

Call auction's principle of matching and closing is: from the lowest price to the highest price of all trading quotations, the trading system chooses the price with the largest volume as the opening price, and all orders above this price and orders below this price are closed at this price; The purchase and sale orders with the same price are sold by the party with a small number of pending orders, and the pending orders not sold by the other party enter the continuous bidding after the opening.