The forward market is that the futures price is higher than the spot price, and the reverse market is that the spot price is higher than the futures price, so speculators who are long-term markets should buy the latest monthly contract; Short speculators should sell long contracts; Speculators who are long in the reverse market should buy long-term monthly contracts with longer delivery months, and speculators who are short should sell short-term monthly contracts with shorter delivery months, so that they can get more profits when the market falls.