There are usually two ways to limit the opening of stock index futures. One is one-day limit, that is, limit the number and proportion of positions held by traders in one day to prevent market fluctuations caused by a large number of positions; The other is total limit, that is, limit the total position of the stock index futures contract corresponding to the trader. These two methods are combined to balance the interests of the market and traders.
Restricting the opening of stock index futures is an important means of supervision. As the supervisor of the financial market, the futures exchange should protect the interests of investors and the stability of the market, and avoid the market risks and systemic risks caused by excessive opening of positions by individual traders. Therefore, the formulation and implementation of the policy of restricting opening positions is not only an important measure to protect investors, but also an important measure to maintain market stability and supervise health.