That is to say, the debt will not be settled on the same day, and after the transaction is completed, all contract gains and losses, deposits and handling fees will be settled for the traders at the settlement price. Accounts receivable and accounts payable are transferred on a net basis, and the margin is increased or decreased accordingly. If the margin balance is lower than the specified standard, additional margin is required. This system can effectively prevent risks and ensure the normal operation of the market.