For example, if you make a futures contract with a margin of 10000 yuan, when the price fluctuates in the opposite direction, you will lose your available funds (5000 yuan) first, and then you will start to lose your margin. When the available funds are 0, the futures company will have the right to make a strong margin, and they will inform you to increase the margin or reduce the position. If you do nothing, you will continue to lose money and will be forced to make a strong margin.