China is the country with the most abundant magnesium resources in the world, including amazing reserves of ore magnesium and Salt Lake magnesium. Among them, Dashiqiao City, under the jurisdiction of Yingkou City, Liaoning Province, where the ore magnesium is most concentrated, is known as the "magnesium capital of China". The total proved reserves of magnesium resources in the city are 4.456 billion tons. Among them, the total proved reserves of magnesite are 3.006 billion tons and the retained reserves are 2.919 billion tons. In December 2002, Dashiqiao was established as the national magnesium material industrialization base by the Ministry of science and technology of the people's Republic of China. In April 2005, Dashiqiao was awarded the title of "national magnesium refractory production and export base" by China Refractory Industry Association. At present, the city has more than 570 enterprises of various magnesium products, with an annual output of more than 7 million tons of various magnesium products. The type, output and export of high-grade magnesium products, as well as the equipment level and innovation ability of magnesium products enterprises rank first in the country. China's salt lakes are rich in magnesium resources, but due to the limitations of regional economy and technology, the degree of comprehensive utilization of resources in salt lakes is still low. For example, the development of salt lake resources in Qinghai mainly focuses on the production of potassium fertilizer, with 8 ~ 10 tons of magnesium chloride per ton of potassium chloride. For decades, with the continuous expansion of the production scale of potassium chloride, the magnesium chloride brine produced has also increased. At present, the annual production scale of potassium chloride in Chaerhan Salt Lake is about 3 million tons, and the by-product of magnesium chloride is about 24-30 million tons. As a primary product of magnesium chloride, the annual sales of magnesium chloride is about 300000-500000 tons. A large amount of magnesium chloride is not used. It is basically discharged and returned to the salt lake as waste liquid through pipelines and channels, resulting in local enrichment of magnesium salt, which not only causes waste of resources, but also destroys the resource structure of the salt lake to a certain extent, Affect the sustainable development and utilization of potassium resources in salt lakes. Qinghai Salt Lake is a very valuable resource with high grade, large reserves and easy exploitation. The salt lake in Qaidam Basin in Qinghai has proven magnesium chloride reserves of 4.82 billion tons, of which Chaerhan Salt Lake has magnesium chloride reserves of 4.06 billion tons. However, due to historical reasons and technical constraints, we have not paid enough attention to the utilization of Salt Lake magnesium resources for a long time, and the development of Salt Lake magnesium resources is only in the primary stage. Therefore, combined with the characteristics of magnesium resources, developing new energy-saving technologies to produce high value-added magnesium products (including but not limited to anhydrous magnesium chloride, metallic magnesium, etc.) to meet market demand and promote the transformation of magnesium resource advantages into economic advantages is the development direction of China's magnesium industry, At the same time, it is also the need of sustainable development, environmental protection, energy conservation and emission reduction.