This is the basis of oil cross-market arbitrage, and the main reason for the oil futures price difference between the two markets is: 1. The psychological price of investors in the two markets is different; 2. There is a price difference between the spot oil in the two places; 3. The net inflow of oil futures funds in the two markets is different, which is a comprehensive result.

Generally, the oil price difference fluctuates around 10 yuan. When the spread seriously deviates from 10 yuan, there will be cross-market arbitrage opportunities. If the price difference is too large, it will be positive arbitrage, and if the price difference is too small, it will be reverse arbitrage. The specific operation is very simple and the risk is relatively small, so it is a good tool for investment and financial management.