Theoretically, only if your settlement reserve is negative, will you add margin. However, in practice, for the sake of their own safety and risk control, futures companies will generally give an early warning, ask for margin or lighten or close their positions on their own when the market continues to develop in a direction unfavorable to your positions and your settlement reserve is already relatively small. For the sake of their own safety, futures companies will increase a certain proportion on the basis of the trading margin charged by the exchange, so as to avoid the loss even if customers explode their positions. Unless there is a continuous one-way stop loss, such as the subprime mortgage crisis in 2008, the current futures supervision system is very strict under normal circumstances, and the probability of malicious forced liquidation is very small.