Since domestic stocks can only be long, you can buy as much as you sell, which means the amount of buying and selling is always the same; However, futures can be short. In the process of hedging transactions, there may be buying and opening positions, selling and opening positions, buying and closing positions and selling and closing positions. As for the nature shown in the final transaction details, it depends on who placed the order for this transaction, such as the short position, that is, the customer who closed the position first. As for the following spot (turnover of this transaction) and position difference, here is an example: For example, first, Party A issued an order to sell 10 lots of a909 at 3570; Second, it placed an order to buy 7 lots of a909 at 3570; Third, it placed an order to buy 3 lots of a909 at 3570; Then, the transaction details show the price of 3570, the spot price of 20 and the warehouse difference of -6, that is, 357020-6; It means: the transaction price of this transaction is 3570 yuan/ton, the volume is 20 lots (10 hand position, 7 hand position and 3 hand position), the position difference is reduced by 6 lots (10 hand position plus long position, 3 hand position plus short position, 13 hand position plus long position, but the position is closed again.

The meaning of several other transactions is similar. In short, as long as you buy and sell the same amount in futures trading, you may buy or open positions in the middle, or you may sell or open positions, so the position difference will change, but the volume will increase.