According to the policy of CICC, the third Friday of the delivery month is the delivery date of stock index futures, so before that, you can buy and sell contracts or participate in cash delivery.

There are two delivery methods, cash delivery and physical delivery. Commodity futures are generally delivered in kind, while stock index futures are delivered in cash. Through the column of official website and trading calendar of each futures exchange, there is a quick method to query the delivery date of each contract.