In order to control the risk of price fluctuation, prevent the risk of excessive price rise or fall, and ensure the orderly and efficient operation of the futures trading market, China's futures trading market implements the price limit system, flexibly adjusts the price range every day, and takes certain risk control measures in case of price rise or fall. 1. In case of daily limit, exchanges generally take the following measures to control risks: 1 When futures contracts are trading daily limit, the matching of transactions follows the principle of closing positions first and then timing, but when new positions are opened that day, the principle of closing positions first is not followed. 2. When a contract continues to rise (fall) and one party has no continuous quotation, a compulsory lightening will be implemented. During the compulsory lightening, the Exchange will declare the open positions at the daily limit price, and automatically match the transactions with profitable customers with the daily limit price and the net positions of contracts according to the positions. Its purpose is to quickly and effectively resolve market risks and prevent a large number of members from defaulting. 2. The futures exchange shall handle the price limit flexibly: 1 For newly listed varieties and newly listed futures contracts, the price limit is generally 2 to 3 times the price limit stipulated in the contract. In the process of futures contract trading, when the contract price rises and falls continuously in the same direction, when there is a national legal holiday, or when the exchange thinks that the market risk has changed obviously, the exchange will adjust its price limit according to the market risk. 3. If two or more price limits stipulated by the Exchange are applicable at the same time, the price limit shall be determined according to the maximum value of the prescribed price limits. The flexible setting of price limit and risk control measures of futures exchange can effectively slow down and restrain the ups and downs caused by some unexpected events and excessive speculation on futures prices, narrow the price fluctuation range of trading days, and lock in the maximum profit and loss held by investors in each trading day.