Delivery: refers to the performance of the contract within the pre-agreed time according to the results of securities liquidation after the buyer and seller reach a transaction in the process of securities trading. The buyer needs to pay a certain amount of money to obtain the purchased securities, and the seller needs to pay a certain amount of securities to obtain the corresponding price. In this process of clearing funds and goods, the receipt and payment of securities is called delivery. The essence of buying and selling stock index futures is to sign a contract with others and buy and sell futures indexes at the agreed price and quantity within the agreed time. This contract has an agreed final trading day (that is, the date of final performance of the contract, usually the third Friday of the contract month), and this trading day is the delivery date of the futures index. When the agreed final performance time comes, the buyer and the seller must close the position (terminate the contract) or make delivery (cash settlement). The delivery date of stock index futures is the expiration date of stock index futures contracts between buyers and sellers, and both parties end the expired open contracts through the transfer of ownership of futures contracts.