Introduction to Kaiyang: Kaiyang County, which belongs to Guiyang City, Guizhou Province, is located in the hinterland of Guizhou Province, with a total area of ​​2026 square kilometers. It consists of 6 towns and 10 townships with a population of 430,000 (2013). It is 66 kilometers away from Guiyang, the capital city of the south, and 110 kilometers away from the historic city of Zunyi in the north. It is connected to the sub-central area of ​​Guiyang and Zunyi. The forest coverage rate is 52.92%, ranking the highest in the middle. The reputation of “Hometown of Chinese Prose Poetry”, “Hometown of China's Selenium-enriched Agricultural Products”, “China Green Phosphorus Capital” and “Karst Eco-World Park” is the country's first circular economy phosphorus coal chemical eco-industrial demonstration base county and Guizhou Province Economically strong county. Kaiyang County's high-quality rich mineral reserves of 392 million tons is one of the three major phosphate mining areas in China, and is also known as “Sanyang Kaitai” in Hubei Xiangyang and Yunnan Kunyang.