Pu'erh tea is the use of green tea or black tea by steaming and become a variety of Yunnan tightly pressed tea in general, including Tuocha, cake tea, square tea, tight tea, etc..

The classification of tea is mainly based on the production process, now Pu'er tea production process does not belong to the six tea system, but a self-contained special tea. Early there is Pu'er tea defined as black tea, but its production process is not the same as the black tea, now generally categorized Pu'er tea as a special tea category, does not belong to one of the six tea systems.