Due to the rapid changes in the market, the deposit in the account can no longer maintain the original contract before the investor adds the deposit. This kind of margin for forced liquidation due to insufficient margin is "zero", commonly known as "short position".

Futures institutions will not let you open a position, because once you open a position, the money you owe is paid in advance by the institution, so the futures institutions will definitely inform you to close the position in time, or force you to close the position when your book risk is high.