It is a fact that you can transfer the use value of goods by selling them in the spot market, so as to get money. At present, your idea is to stay on this theory. Then shorting futures means that you have not transferred the use value. You can understand that you just used about 10% of the funds instead of transferring the use value. You can't cash in the funds. On the contrary, you have to take up funds, which is the deposit. It is about 10% of the commodity value. Only when you close your position and know the trading behavior can you come up with the profit and principal, or the principal after deducting the losses and transaction costs.