First of all, we must understand how the ups and downs stop. At the daily limit price, there are a huge number of hanging orders, such as 10000 lots, while the selling orders are only 10 lots, which can only be displayed after being eaten by the orders. After the daily limit, stocks can be sold and of course bought, but the problem is that according to the trading principle, price comes first and time comes first. When the stock price is blocked by buying 10000 lots, you have to wait until 10000 lots to close the deal. Of course, if there is a huge number of orders, such as 20,000 lots, the daily limit will be opened. So is the limit.