1, highland barley, called "Nai" in Tibetan. Also known as naked barley, rice barley, yuanmai and huaimai, it is a special type of barley, and it is called naked barley because its inner and outer glumes are separated from caryopsis and its grains are bare.

2. The history of highland barley China had a history of barley cultivation as early as the Western Zhou Dynasty (BC 1 100), with six-rowed barley as the main crop. Mainly distributed in the upper reaches of the Yellow River and arid desert areas in northwest China. After selection, domestication and cultivation, plateau people cultivated wild common barley into highland barley, which became local food and horse feed. According to scientific research, the Qinghai-Tibet Plateau is the earliest region in the world where highland barley is planted. In fact, highland barley is the name of green naked barley by the people of Qinghai-Tibet Plateau. In other parts of China, it is called Yuanmai, Bare Barley or Bare Barley. Because of its wide adaptability, strong resistance and stable yield, the planting area has gradually expanded to all parts of the country. Today, it is mainly distributed in Tibet, Qinghai, Ganzi and Aba Tibetan Autonomous Prefecture of Sichuan Province, Gannan Tibetan Autonomous Prefecture of Gansu Province, and parts of Yunnan and Guizhou.