On April 20, many people should still remember this day, because on this day, the crude oil futures price actually appeared negative. The simple understanding is that if you buy crude oil, the crude oil dealer will still pay you back, so why is this happening? Why is there a negative oil price? There are three reasons for negative oil prices: first, the global crude oil storage is almost full, so negative oil prices appear without stopping production and no one consuming. Second, the May contract of US oil futures is due for delivery on April 2 1, so this is the last selling opportunity for bulls, so panic selling leads to bad oil prices. The third is the result of American manipulation. Prior to this, the clearing house of the Chicago Mercantile Exchange in the United States had modified the software system on April 15, that is, it could trade even if there was zero or negative price. In the world crude oil system, Saudi Arabia's crude oil cost is nearly $5 a barrel, Russia's is more than $ 10, and only the United States has reached $40 a barrel. Therefore, after the start of this round of oil war, only the United States lost money when crude oil remained at $20 per barrel for a long time. In this regard, hundreds of billions of corporate bonds of American oil companies are at risk of collective explosion, so negative oil prices are essentially a test of Russian and Saudi operations. Of course, we can find that on April 20, except for May crude oil futures, other Brent crude oil contracts remained at around $20 per barrel. This abnormal performance just illustrates some problems. Therefore, on the one hand, this negative oil price is caused by the sharp drop in world demand under the influence of the epidemic, on the other hand, it is caused by the oil war between the United States, Russia and Saudi Arabia.