The provisions on the margin ratio of commodity futures trading in China's domestic exchanges show the following characteristics: (1) Generally speaking, with the approach of delivery, the margin ratio of trading increases. (2) With the increase of contract positions, the Exchange will gradually increase the trading margin ratio of the contract. (3) When the futures contract goes up and down continuously, the trading margin ratio will increase accordingly. (4) When the price of a certain variety contract changes according to the settlement price within one month, and the cumulative fluctuation range of several consecutive trading days reaches a certain level, the trading ownership will unilaterally or bilaterally increase the trading margin for some or all members in the same proportion or in different proportions according to market conditions. (5) In case of abnormal trading of futures contracts, the Exchange may adjust the trading margin ratio according to the prescribed procedures.