The biggest difference between the settlement price of stock index futures and commodity futures (taking Dashang as an example) is that although the settlement price of commodity futures is the weighted average price of all transaction prices in the ten trading days before the closing date (including the closing date), it still depends on the scale of funds in the commodity futures market, and the settlement price of stock index futures depends on the strength of the number of constituent stocks held by long-term funds and short-term investors in the securities market. There is no direct relationship with the scale of funds in the stock index futures market (of course, there is an indirect relationship). Before the last trading day of stock index futures, the funds in the futures market can theoretically roll over the river, and the daily closing price can be controlled with sufficient funds (indirectly affecting the daily settlement price). However, when entering the last trading day, the decision on the delivery settlement price is determined by the financial strength of the whole stock market, which is a substantial difference between the delivery settlement price and the daily settlement price.