There is a basis difference between the futures market and the spot market, which is mainly composed of reasonable expenses such as transportation fees, storage fees and handling fees, but they are not completely equal. This is because the futures market and the spot market are two closely related but different markets, with the same price trend, but the price range is not exactly equal. Before the expiration of each futures contract, due to the existence of delivery, the basis of the two markets will be forced to converge and the regions will be consistent. At this time, the futures market and spot market prices are often the most consistent period, and the basis difference is also the smallest period. As for how to use premium to operate, it mainly depends on the basis trend of your futures contract and spot market. If there is a tendency to enlarge the basis, you can eat it in the spot and sell it in the futures market to get a larger basis income, but this kind of operation space is generally not large, mainly depending on your forecast of future market conditions and the relevant fluctuation range to be optimized on the basis of deducting costs.