Asphalt is a derivative of crude oil, and crude oil is a residue extracted from petroleum, so the trend of asphalt and crude oil is the same. When the crude oil inventory increases, it shows that there is an oversupply of crude oil in the market, which leads to the decline of crude oil and asphalt. When the crude oil inventory decreases, it shows that the market demand for crude oil is strong, which leads to the increase of crude oil and asphalt.