According to the Administrative Measures for Risk Control of China Financial Futures Exchange (Draft for Comment), compulsory lightening is a measure taken by CICC to quickly and effectively resolve market risks and prevent a large number of members from defaulting.

Specific to the Shanghai and Shenzhen 300 stock index futures, the compulsory lightening system refers to automatically matching all investors who have been declared in the trading system as unable to close their positions at the price limit, and the unit net position loss of the investor's contract is greater than or equal to 10% of the settlement price of the day, and the net position profit of the contract is greater than zero. According to the proportion of positions, the price of compulsory lightening is the stop price on the contract day. The economic losses caused by the above lightening shall be borne by the members and their investors. On the day of compulsory lightening, the trading margin will be restored to the normal level at the time of settlement, and the price limit of the contract will be implemented according to the contract on the next trading day.