In futures trading, the change of volume and position are two important factors to judge the market operation law. Open interest contract is the accumulation of all open interest contracts in futures or options contracts, and it is a sign of the activity and liquidity of the futures market. When the price reaches or approaches a specific price, it will affect the buying and selling ability of investors. The seasonal law of positions is very important for investors to analyze the market. If the price is on the rise and the total position is higher than the seasonal average (5-year average), it means that new funds have flowed into the market, buying is strong and a bull market has emerged.