For members and members-to-customers, the settlement method of the exchange is to mark the market day by day, and settle the gains and losses of position contracts, historical position contracts and historical positions according to the settlement price every day. The way you said to calculate the closing profit and loss with the selling transaction price and the buying transaction price is called trading hedging settlement method, which is not used by futures companies and exchanges. You can only find this transaction hedge in the margin monitoring center.

In addition, I would like to remind you that whether you use transaction-by-transaction hedging or mark-to-market settlement method, it will have no impact on the ultimate rights, expenses and risks of your account. The only difference is that some data definitions are different. For example, the data definition of "balance of the day" in the two methods is different, but it does not affect your rights and expenses.

In other words, what kind of settlement method you use, your rights and interests are 1 gross, that is 1 gross, not a penny less. Don't worry so much. What can't be changed can only be adapted.