Different varieties have different degrees of plate expansion.

The rule of daily limit is: if the daily limit is on the first day, increase the percentage of the daily limit on the second day, such as 6% on the first day, and then 7% on the second day. If the daily limit is in the same direction, the daily limit will continue on the third day, such as 8%. If the daily limit is in the same direction on the third day, the daily limit will be on the fourth day. ...

On the fifth day, return to the original setting or stop the board at 6%, and so on.

The purpose of expanding the board is to protect the market and increase liquidity, but it will also cause greater losses to investors under extreme market conditions.