Futures generally need to add margin when there are many losses.

The rights and interests of futures are divided into two parts, one is trading margin and the other is settlement margin. The trading margin before liquidation is always the same. Since futures are closed without debt on the same day, when the contract loses money, you will use the settlement margin to make up the trading margin. When the settlement margin is insufficient to make up for it, you will receive a notice of additional margin.