The order of seven printing grades of tea in China is red printing, first-class red printing, rhubarb printing, first-class blue printing, green printing of big characters, second-class blue printing and green printing of artistic characters. At the end of 1950s, the first batch of products (red-printed round cakes) launched by China Yunnan Tea Company registered and used the brand trademark of China tea, which started the popular wave of (printed round tea) in 1950s. Among the Pu 'er tea products produced by China Tea Company, the only products with the logo of "Bazhong Tea" and the word "tea" in red are Pu 'er tea printed in red and Yunnan Tuocha printed in red, which is unprecedented. Besides its life experience value, the quality of Yin Hong Pu 'er tea is also the best among modern Pu 'er tea. Its tea has the qualities of green camellia, full rope, reddish color, shiny tea surface, red tea soup, soft and tender leaf bottom and so on. In addition, the inside of the tea is completely buried in the center of the tea cake, made with old-fashioned molds and using ancient production techniques, all of which are umbilical mortar round cake tea. Red-printed round tea, with thick tea soup and the fragrance of orchids or wild camphor, is one of the foundations for Menghai tea factory to stand out in the history of modern Pu 'er tea.