Dianhong tea is one of China's famous black teas, alongside Keemun Gongfu and Minhong Gongfu! However, Dianhong tea, also known as Yunnan black tea, contains theaflavins and thearubigins, which determine the quality of black tea. The higher the content of these two components, the better the quality. The main factors determining the content of theaflavins and thearubigins are, first, the tea plant variety, and second, the tenderness of the fresh leaves.

Dianhong tea is made from fresh leaves of the Yunnan large-leaf tea variety with appropriate tenderness. The fresh leaves of large-leaf tea varieties contain richer tea polyphenols than other tea varieties. Through processing, they can produce a large amount of theaflavins and thearubigins. Additionally, they have higher contents of caffeine and water extracts. Therefore, the black tea produced has a strong aroma, rich flavor, bright red liquor, and superior quality. Dianhong tea comes in two types: Dianhong Gongfu tea and Dianhong broken tea.

Keemun black tea is made from medium- and small-leaf varieties, offering a relatively mild taste. Keemun black tea is produced in the Qi Men area of Anhui Province. The natural quality of the tea is best in areas like Likou, Shanli, and Pingli in Qi Men. The international market ranks "Keemun" alongside India's Darjeeling tea and Sri Lanka's Uva seasonal tea as the world's three recognized high-aroma teas. Keemun black tea is of exceptional quality and is praised as "the finest among all fragrances." This is inseparable from the superior natural ecological conditions of the Qi Men region. Qi Men is located in the southern part of Anhui, surrounded by branches of the Huangshan Mountains from east to west. To the northwest are the Dahongling and Li Mountains, to the east is the Nanmu Ridge, and to the south is the Jugen Ridge. Mountainous areas account for 90% of the total area, with an average altitude of about 600 meters. About 80% of the tea gardens are distributed in canyon areas at altitudes of 100–350 meters. Forest coverage exceeds 80%. The significant temperature difference between day and night, frequent cloud and mist cover, and relatively short sunlight duration create a natural ideal environment for tea tree growth, contributing to the special aromatic richness of "Keemun" tea.