According to the provisions of CICC, the delivery date of stock index futures is from the contract month to the third Friday. For example, the delivery date of the June contract is June 1 day. The first delivery date is the delivery date of the May contract. The next one is the June contract. Friday (May 2, 20 131day) is the delivery date of 1005 stock index futures contract. Prior to this, people in the industry generally believed that there would be no delivery day effect in the market. Judging from the fact that the current trend on the 20th is approaching and the contract positions continue to shrink in May, this judgment is obviously reasonable. 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, which will be postponed in case of national legal holidays), 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).