Green tea has a history of more than 3000 years, and the production and processing technology of green tea appeared in the Three Kingdoms period. The method of making "steamed green tea" came into being in the Tang Dynasty. In the Song Dynasty, "steamed green cake tea" was the mainstay. Later, in the Ming Dynasty, green tea was popularized vigorously, and "steamed green cake tea" developed into loose tea, which was widely produced and prevailed, which promoted the development of green tea processing technology.