During the piled-up fermentation procedure of Pu'er tea, the chemical component of sun-dried green tea (such as tea polypheol) have been transformed into special flavor and taste components after a series of complicated reactions because of the common effects from the extracellular enzymatic action of microorganisms, heat of microorganisms metabolism, and the water in tea leaves, which results in the special flavor and taste of Pu'er tea. Therefore, the formation of Pu'er tea flavor is due to the works of m...