In the futures market page, the inner disk is usually represented by S (take the initial letter S of English sell [sel]) and the outer disk is represented by B (take English buy [ba? ] the first letter b) buy means. Inner disk: the number of transactions at the purchase price, that is, the number of transactions when the seller voluntarily places an order to sell the futures contract at a price lower than or equal to the current one, two or three, which is displayed in green. The number of inner disks shows the energy that the empty side is eager to sell. External disk: the number of transactions at selling price, that is, the number of transactions in which the buyer voluntarily places an order to buy futures contracts at a price higher than or equal to the current selling price, selling price, selling price and selling price, which is displayed in red. The number of external disks shows the energy that many parties are eager to buy.

The external market is also called active buying, that is, the accumulated trading volume at the selling price; Internal selling is also called active selling, that is, the cumulative trading volume at the purchase price. The outer disk reflects the willingness to buy actively, and the inner disk reflects the willingness to sell actively.

Inner disk: buy one, buy two, buy three price transactions, and add the statistics of the number of buy transactions to the inner disk.

Outer disk: a transaction that is concluded at the price of selling one, selling two and selling three. Sales statistics are added to the external disk. The two data of inner disk and outer disk can be used to judge the strength of buying and selling rights. If the number of external disks is greater than the number of internal disks, the buyer is stronger; If the number of inner disks is greater than the number of outer disks, the strength of the seller will be stronger.