15 minute suspension is based on the practice in the international market. The developed futures exchanges in the world have set up an intraday rest system, aiming at relaxing investors' mood and relieving nervous anger.

The delivery date is determined according to each delivery month, and there is not much pressure when the contract is launched. Considering the convenience of delivery and sufficient transactions. The delivery date has a certain emphasis, which needs to consider some attributes of the subject matter of the contract and combine the circulation of production and trade spot. In the end, it is also a good market tool for production, processing and trade-related enterprises to avoid the risk of price fluctuation.