The overnight settlement of futures positions is to calculate the floating profit and loss of open positions of members and determine the amount of margin payable for open positions according to the settlement price of the day's transactions. If the margin amount is not enough to maintain the open position contract, the clearing institution will inform the members to make up the difference before the second largest market opening, that is, to add margin, otherwise they will be forced to close their positions.

The calculation method of floating profit and loss is: floating profit and loss = (settlement price of the day-opening price) x position x contract unit-handling fee. If it is positive, it means that it is a long floating profit or a short floating loss, that is, the price increase after the long position is a long floating profit, and the price increase after the short position is a short floating loss. If it is negative, it means the floating loss of bulls or the floating profit of bears, that is, the price drop after the bulls open positions indicates the floating loss of bulls, or the price drop after the bears open positions indicates the floating profit of bears. If the margin amount is not enough to maintain the open position contract, the clearing institution will inform the members to make up the difference before the second largest market opening, that is, to add margin, otherwise they will be forced to close their positions. If there are floating profits, members can't put forward this part of the profits unless the liquidation contract is closed and the floating profits are turned into actual profits.