There are two ways to reach the daily limit. The first one is the daily limit before the last five minutes of the day, and it has been opened in the last five minutes. In this case, the trading system will remain unchanged the next day. If the daily limit has been in the last 5 minutes, it will become a one-sided market. The margin and the increase and decrease of the second trading day will be expanded by 50% on the existing basis. If the second trading day is not a one-sided market (the last 5 minutes are in a daily limit state), the third trading day will return to the original level. If the second trading day is still a one-sided market, the increase and decrease and the margin on the third trading day will be increased by 50% on the basis of the second trading day. The third trading day is not unilateral, and the fourth trading day is resumed. If the third trading day is unilateral, the contract will be closed for one day on the fourth trading day, and the exchange will carry out compulsory liquidation or agreement liquidation on the fifth trading day according to the profit and loss situation.