First, the market trend of spot crude oil in the inner disk is a non-instantaneous market based on the market trend of crude oil futures in the outer disk. Because there are many barriers and price conversions in the middle, the market trend is slower than that of the international market. Especially in big markets such as EIA.

Second, most trading units in the inner market are priced in tons. Under the same conditions, it is converted into a standard contract of external disk 1 0,000 barrels, and the US crude oil transaction fee is 15 US dollars, and the internal disk spot fee is 200 US dollars, with a difference of 10 times.

Third, the trading method of the outer disk is matchmaking, and the exchange is only the intermediary between buyers and sellers and does not participate in the transaction. Spot trading is a virtual transaction between traders and exchanges or intermediaries.

Fourth, there is the most important one. American crude oil is a trading variety of oil forward contracts, so it is called American crude oil futures, while domestic crude oil is called spot, which can be seen from the name that it is not the same variety at all.