1, short position, that is, in the process of financial investment operation, the commodity price fluctuates greatly, and the ratio of the occupied margin to the remaining available funds is less than the lower limit stipulated by the exchange (the risk rate is less than 50%, and the lower limit stipulated by most domestic exchanges is 50%), and all closed trading orders will be forced to close their positions; The protective measures taken by the exchange to avoid all losses caused by investors' reverse operation when investors are in heavy positions or Man Cang operations;

2. The reason for the short position is that the position is too heavy and the remaining available funds are not enough for 50%.

3. Calculation and publicity of risk rate: risk rate = occupied margin/remaining available funds. When the risk rate is lower than 50%, the trading order will be forced to close the position.

4. Ways to avoid explosion:

A, develop good operating habits, avoid half warehouse or Man Cang order, the best choice is not to occupy more than 20% of the funds. Pay attention to each operation with protective stop loss;

B. When there is an early warning of insufficient funds, it is appropriate to manually close some positions to reduce positions without being forced to close positions;