Rare earths are widely used and are known as “industrial MSG”, “industrial vitamins” and “mother of new materials”. It is used in almost all high-tech products, from IPhone to Tomahawk missiles, from smart phones, electric vehicles, laser instruments, to military engines and satellites. It is of great strategic importance to the world's major technology powers. It is also an extremely precious strategic metal resource. Due to its large role in rare earths and low dosage, it has become an important element to improve product structure, improve scientific and technological content, and promote technological progress in the industry. It has been widely used in metallurgy, military, petrochemical, glass ceramics, agriculture and new materials. A country that relies heavily on China's rare earth industry, which is why there is a paradox that China will use rare earth as an important bargaining chip against the United States.