Accordingly, there are four trading orders: buy open position (buy open position), buy open position, sell open position and sell open position.

When you have an empty order in your hand, your closing order is to buy and close the position, which represents the trading direction, and closing the position represents opening or closing the position.

But in fact, when an exchange trades in the open market, it may handle it in two ways:

1) If your buy-out order is matched with the sell-out warehouse order, it is what you understand as manually selling an empty order, and the existing position remains unchanged.

2) If your buy order is paired with your sell order, both your contracts will be cancelled and your open market position will be reduced by two.

The reverse is also true. To sum up, when selling and buying, the position will increase by two hands; The trading is even or even, and the position remains unchanged; Buy flat and sell flat, and reduce positions with both hands.

When you say "buy more than one short order", it corresponds to "buy flat and buy short orders" in the market. If you close your position here, you should use the first instruction, which you think is correct. This will cancel the contract and release the performance bond. If you use two orders to buy more than one order to open a position, then you have two contracts, one empty order and one multi-order, both directions are locked, and the profit and loss are balanced. But in this case, the deposit is still occupied and cannot be released, which is a bad trading habit.