If you close your position on the same day, the settlement price has nothing to do with you. Your profit and loss are only determined by the price difference between opening and closing positions. But if you do not close the position on the same day, it will be settled according to the settlement price. Rather than the closing price, this is to prevent the closing price from being manipulated, because as long as a large amount of money is invested at the last minute, it is easy to pull the closing price very high. In this way, the market is manipulated, which is unfair to many investors. Therefore, if your position is not closed on the day, it will not be settled based on the closing price, but the settlement price.

The calculation method of the settlement price is the weighted average price of the contracts traded in the last two hours of the contract day, which is basically uncontrollable by others