Short for short, the position difference refers to the difference between the 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 this transaction order and the previous instant position, whether to increase or decrease the position.