It is mentioned that the establishment of "tribute tea system" is one of the important reasons for "tea prosperity in Song Dynasty". However, this kind of imperial tea inherited from the Tang and Song Dynasties not only consumed a lot of manpower and material resources, but also caused certain exploitation to tea farmers. In the twenty-fourth year of Hongwu (139 1), in September, Zhu Yuanzhang ordered to stop the production of Longfeng tea, saying, "Stop making Dragon tea, and only bud tea is allowed." This "imperial edict" has come out, and everyone from the palace to the lower level must abide by it.