Log in to market software, game experts or cultural finance. Now 1509 is the main contract. If you want to see the market, for example, if you say the contract is 130 1, you can look for the K-line chart of the current contract date 160 1 and call back for 20 13 65438. The previous K-line with trading volume was 130 1 the trend of the contract. Click the crosshairs where you want to view the intraday chart on the K line and press Enter, and the historical chart you want to view will appear on the computer screen. I don't know what I'm talking about, do you understand?