Introduction to Chun'an: Chun'an is the central city of the northeastern region of the Central Economic Zone. It belongs to the southern Guizhou Buyi and Miao Autonomous Prefecture, in the middle of Guizhou Province and the middle reaches of the Wujiang River. Chun'an is known as the “Asia Phosphorus Warehouse” for its rich phosphate rock resources. Chun'an is known for having China's largest phosphate rock, and its total resources/reserves rank first in Asia. The history of Chun'an has long been the political, economic, and cultural center of Shuidong. The name of Chun'an County has been in the 160th year since AD ​​160.