Volume: refers to the number of commodity futures contracts bought or sold in a certain period of time, usually the number of contracts traded in a trading day.

I think you should refer to the position.

Open position: refers to the sum of the number of contracts that have not been reversed by buyers and sellers. The size of the position reflects the size of the market transaction and the difference between the long and short sides in the current price. For example, if two people are counterparties, one person opens a position to buy 1 contract, and the other person opens a position to sell 1 contract, then the position is displayed as a 2-hand contract.

Position difference: short for position difference, it refers to the difference between the current position and the position corresponding to yesterday's closing price. If it is positive, add positions today; If it is negative, the position will be reduced. Position difference is the change of position. For example, the position of stock index futures contract in June 165438+ 10 is 60,000 lots, whereas it was 50,000 lots yesterday, so the position difference today is 1 10,000 lots. In addition: there are also changes in position differences in the transaction column. Here refers to the comparison between the position change caused by the current transaction order and the previous instant position, whether to increase or decrease the position.