The futures contract uses the settlement price of the day as the basis for calculating the profit and loss of the day. The profit and loss of the day are transferred at the settlement of the day. The profit is transferred to the investor's futures margin account, and the loss is deducted from his futures margin account. The specific calculation formula of profit and loss for the day is as follows: Profit and loss for the day = ∑ [(Sell transaction price – settlement price for the day) × selling volume × contract multiplier] ∑ [ (settlement price for the day – buy transaction price) × purchase volume × contract Multiplier] (Settlement price on the previous trading day – Settlement price on the current day) × (Selling positions on the previous trading day – Buying positions on the previous trading day) × Contract multiplier. What is the settlement price of the day? The day's settlement price refers to the weighted average price of a certain futures contract's transaction price in the last hour based on trading volume (the calculation result is rounded to one decimal place). In actual calculations, investors are advised to pay attention to the handling of the following special circumstances: (1) If trading is interrupted in the last hour due to system failure or other reasons, the full hour forward after deducting the interruption time will be regarded as the last hour. (2) If there is no transaction in the last hour of the contract, the transaction price in the previous hour shall be the weighted average price of the transaction volume as the settlement price of the day. If there is still no transaction during this period, it will be pushed forward one hour. And so on. If the last transaction of the contract day is less than one hour from the opening time, the weighted average price of the whole day's trading volume will be used as the settlement price of the day. (3) If there is no transaction on the contract day, the calculation formula for the settlement price on the day is: settlement price on the day = settlement price on the previous trading day of the contract + settlement price on the day of the benchmark contract - settlement price on the previous trading day of the benchmark contract. Among them, the benchmark contract is the contract closest to the delivery month that has transactions on that day. If the contract is a newly listed contract, its listing base price will be the settlement price on the previous trading day. If the benchmark contract is a delivery contract on the same day, the delivery settlement price shall be the settlement price of the benchmark contract on that day. If the day's settlement price calculated based on this formula exceeds the contract's price limit, the price of the day's price limit will be used as the day's settlement price. If the settlement price of the day cannot be determined using the above methods or the calculated settlement price is obviously unreasonable, the exchange has the right to determine the settlement price of the day.