Maintain margin: When the futures contract price changes, the customer must maintain the minimum margin amount in his margin account.

In the exchange managed by the maintenance margin system, if your loss is small, your margin amount will be reduced, but it is still higher than the maintenance margin limit, so you don't need to increase the price change margin. Only when your loss reaches a level lower than the maintenance margin, you need to add a price change margin. Make the account funds equal to the initial margin level, and the additional funds are called variable margin.