Of course, in the process of holding positions, traders will have floating profits and losses (the difference between the settlement price and the transaction price) due to the constant changes of market conditions, so the funds actually available in the margin account for making up losses and providing guarantees will increase or decrease at any time. Floating profit will increase the balance of margin account, while floating loss will decrease the balance of margin account. The minimum balance that must be kept in the margin account is called maintenance margin. Xiaojin, a fund-raiser for stock futures, will help you.