The futures position line is the position of the futures contract in the intraday, that is, the position of the contract. Open position refers to the number of open positions held by traders. The center line-hour line K-line chart mainly captures a relatively large band, usually overnight. The blue line represents the position in unit time, and the column represents the turnover in unit time. On the time-sharing chart and K-line chart of the position contract, a dotted line composed of longer line segments will be displayed, that is, the position line.