At present, the fluctuation amount of the stock index 1 point is 300 yuan RMB. As you said just now, if the price difference is 1000 points, it will be 1000×300× lots, and then it will be your profit and loss.

When your position is your capital and you are available, when your available capital is zero or negative, you must add margin (in fact, the futures company will inform you before this).