These two statements are problematic and misleading. I have been doing futures since 2006, and I have never found what you said.

After opening the position, the margin of the position is fixed.

The fluctuation of futures price affects profit and loss, that is, the part of available funds.

For example, 65438+ 10,000 yuan is used to make 90,000 more first-class stock indexes, and there are 1 10,000 available funds.

When the stock index price rises by 300 points, the deposit occupied is still 90 thousand, and the profit part is added to the available funds.

Company stock index fee with turnover of 260,000.