In practice, the shorting of futures contracts is like this: for example, if you short white sugar now, after you enter the trading interface (first get an account in a futures brokerage company), you choose to sell sr 130 1 (the main contract of white sugar) and close your position with one hand (10 ton), for example, the transaction price is 5,500 yuan. Since futures trading is leveraged, you only need to pay the contract value of 6500 yuan. (Different futures companies have different margin ratios. If the futures price does fall after a certain period of time, then you will make money. For example, if the price of futures sugar drops to 5200 after a certain period of time, you can choose to buy sr 130 1. Pay attention to the liquidation, then you can get (5500-5200) * 10 = 30000. Aside from your handling fee, you should make a profit of about 2,970 yuan (generally per lot 15 yuan, less 7 yuan, different trading varieties have different commission standards). If you buy and open a position now, it is a lock position. Wait, that's about it.