1, short position refers to the situation that the value of securities is lower than the total liabilities. 2. borrowing money will break out. For example, you have a principal of 50,000 yuan, and then you borrow 200,000 yuan to buy futures. When the futures fall by 20%, the principal of 50,000 yuan will be lost. If you fall again, it will explode. 3. At present, short positions are mainly in the futures market, and the A-share market is not allowed to borrow money for investment, so there is generally no short position. But Hong Kong stocks or other foreign markets will break out.