Big tea is made of Zhenghe white tea. Big tea generally refers to Tibetan tea. Tibetan tea is the main life drink of nearly 6 million Tibetan minority compatriots, and it is also known as the livelihood tea of Tibetan compatriots. From ancient times to the present, according to different historical periods and local customs, it is also called big tea, horse tea, black tea, coarse tea, south road side tea, brick tea, strip tea, pressed tea, group tea and side tea. Chinese Tibetan tea has been a kind of ancient tea for thousands of years since it was recorded in the Tang Dynasty. It is a kind of post-fermented tea, which is picked in the mountains above 1000 meters above sea level. The tea and red moss that matured in that year are refined by special technology. Tibetan tea is the most typical black tea with dark brown color and post-fermentation.