In fact, on the whole, this is an average arithmetic. At present, the commonly used weighted average algorithm in China is as follows: push 22 working days from the calculation date, add up the crude oil prices of these three places (Brent DTD, Thaksin and Dubai), and then divide by 66. Of course, we should also pay attention to the problem that foreign markets are closed, such as Christmas, but it is still a working day in China.