black rice is a processed product of black rice, which belongs to glutinous rice and is a kind of characteristic variety formed by long-term cultivation of Gramineae rice. The appearance of rice grains is long oval, and the rice husk is grayish brown. The grain types are indica and japonica, and the grain quality is divided into waxy and non-waxy. Brown rice is black or dark brown, with rich nutrition and high edible and medicinal value. Besides cooking porridge, it can also make various nutritious foods and make wine, and is known as "black pearl" and "king of rice in the world". The most representative black rice in Yangxian County, Shaanxi Province [1] has been known as "medicinal rice", "Gong Mi" and "longevity rice" since ancient times.