When your funds are less than the exchange margin comparison, you need to add funds, that is, when you transfer money to your futures account, you only need your available funds to reach the exchange margin comparison of your list. For example, 1 hand copper costs 30,000 yuan according to the margin ratio of the exchange and 35,000 yuan according to the margin ratio of the futures company. When you have a list and the deposit is not less than 30 thousand, you don't need to add it. When the market is unfavorable or the exchange raises the margin, you need additional funds.