Your question is not very clear. I guess you want to ask why the futures price of commodities is different from the spot price. This is because the futures price is a forward price, and each contract has a delivery period, such as rb 1505, which is the price of futures rebar delivered in May 15. The spot quotation is the current price. One is the current price and the other is the expected price in the future. Of course it will be different. In addition to people's expectations of the overall market situation, the forward price also includes warehousing, storage, delivery and other expenses.