The hometown of black rice in China is Yangxian County, Hanzhong City, Shaanxi Province, which is located in Hanzhong Basin with mild climate and abundant rainfall. It is one of the most suitable areas for planting one-season rice in China, the ancestral land and birthplace of "black pearl" black rice, and the best producing area of black rice in China. According to a lot of research, black rice was planted along the Yangxian River in Shang and Zhou Dynasties, with a long history of at least 3,500 years.