The open contract of stock index futures investors after opening positions is called open contract, also known as open position. After the stock index futures investors open their positions, there are two ways to close the stock index futures contract: either close the position in advance or hold it until the last trading day for cash delivery. Total open position: refers to the total number of "open positions" of all investors in futures contracts.

In the market information released by the exchange, there is a special "total position" column.

The change of total positions reflects investors' interest in contracts and is an important indicator for investors to participate in contract transactions. If the total positions keep increasing, it shows that both sides are building positions, investors' interest in contracts is increasing, and OTC funds are pouring into contract transactions; On the contrary, when the total position decreases, it shows that both parties are closing their positions and traders' interest in the contract is declining. On the other hand, when the trading volume increases, the total position changes little, indicating that the market is dominated by changing hands.