The whole process of futures trading can be summarized as opening positions, holding positions, closing positions or physical delivery. Opening a position means that a trader newly buys or sells a certain number of futures contracts. In futures trading, if one party wants to buy, it must correspond to the other party's desire to sell. Suppose A wants to buy 10 lots of soybeans, and B wants to sell 10 lots of soybeans to open a position, then the two are just clinched. When two positions are opened at the same time, and the variety and quantity of trading contracts are the same, it is called double opening. Double opening means that two positions are opened at the same time, so add positions. Double leveling means that two positions are closed at the same time and the positions are reduced.
If you sell a lot, that is, B wants to sell 12 lots, and A only buys 10 lots, then there is a third buyer to close the position, and the same reason is empty. Short position means that the number of orders sold is greater than the number of orders bought and the number of orders opened, so it is called short position