Futures settlement warehouse receipt is greater than inventory sales. Generally speaking, the stock source of futures exchanges is: short customers who are ready for physical delivery. Under normal circumstances, if the inventory is large, futures and spot prices will fall; If stocks are low, futures and spot prices will rise. The buyer of the call option buys the call option because it is determined that the price of the relevant futures market is likely to rise sharply through the analysis of the price changes of the relevant futures market, so he buys the call option and pays a certain premium. Once the market price really rises sharply.