The daily mark-to-market system generally includes calculating floating profit and loss and calculating actual profit and loss: 1 and calculating floating profit and loss. According to the settlement price of the current transaction, the settlement institution calculates the floating gains and losses of the open contracts of members and determines the amount of the deposit payable for the open contracts. The calculation method is: floating profit and loss = (settlement price of the day-opening price) × position × contract unit-handling fee. If there is a floating loss in the account and the amount of margin is not enough to maintain the open position contract, the settlement institution will inform the members to make up the difference before the market opens the next day, that is, add margin, otherwise it will be forced to close the position. If the account is a floating profit, the profit part cannot be withdrawn unless the contract is closed and the floating profit becomes an actual profit. 2. Calculate the actual profit and loss. The profit and loss realized by liquidation is called actual profit and loss. The calculation method of actual profit and loss of bulls is: profit and loss = (closing price-buying price) × positions × contract units-handling fee. The calculation method of short profit and loss is: profit and loss = (selling price-liquidation) × position × contract unit-handling fee.