The main crude oil contract refers to the main crude oil contract, which is a kind of futures contract. There are many kinds of crude oil futures contracts, and there is one contract every month. The main crude oil contract means that the exchange will agree on the main crude oil contract with a large number of positions and traders. China crude oil futures contract is listed in Shanghai International Energy Exchange Center with the letter code SCM. The detailed information of the contract is shown in the figure, which investors can find in the futures trading software: