Answer: 1: There are price limits, so it won't be so much to go high and low. 2. This situation is called short selling. Generally, all the money in the account is lost, and the remaining futures companies will pull it down to pay for it (of course, the futures companies will ask you for it, but no one will give it). 3. Set a stop loss overnight. As long as there is a gap, it will not reach your stop loss of 4200, and set a stop loss of 4500, and press 4500. 4. Forced liquidation generally means that your risk reaches 130%, and futures companies will force liquidation in order to prevent sudden opening accidents. The risk is your margin plus available funds. For example, if you buy a hand of beans at 4000, there will be 4500 in your account and it will rise to 4 the next day. 100, then your risk is 4000 \ {4000+(-500)} =1.14, which means 1 14%. Then why add -500? Originally, your account had a 500 yuan balance, but the price has increased 100.