The price of the distant month contract is greater than or equal to the price of the recent month contract. In the reverse market, the spread is positive, and the inter-period arbitrage position cost is calculated by adding the cost of the far-month contract to the cost of the near-month contract, so the calculated data is accurate. Intertemporal arbitrage refers to buying and selling futures contracts of the same futures product in different delivery months in the same market (exchange), in order to hedge and close these futures contracts at the same time at a favorable opportunity.