If each transaction is successful, the deposit will not be refunded if the position is not closed at the time of purchase, but if there are sufficient funds in the warehouse, the transaction can still be continued; After buying, close the position, complete a transaction perfectly, the deposit will be returned to the stock fund immediately, and the transaction can continue.

In stock index futures trading, margin is the fund used for settlement and performance guarantee. Investors who participate in stock index futures trading, whether as buyers or sellers, need to pay corresponding deposits according to their positions. Margin can be divided into two parts: trading margin and settlement reserve. The trading margin is calculated according to a certain proportion of the contract value of the position, which is occupied by the contract and may not be used for other purposes. The part of the futures margin account that exceeds the trading margin is called the settlement reserve, which investors can freely control, and it is also called the available funds.