Green mountain and green water tea is also called "Ilex microphylla". There are mainly two kinds of Kuding tea, one is from Hainan and Guangxi, and the other is from Sichuan, Yunnan and Guizhou. Kuding Xiao Ye is a kind of slightly bitter and sweet herbal tea, which is drunk by southerners in China for a long time. According to Compendium of Materia Medica, it has the functions of "bitter leaves, mild taste, no toxicity, cold nature, quenching thirst, improving eyesight, diminishing inflammation and promoting diuresis", and has the functions of clearing away heat and toxic materials, reducing fire and diminishing inflammation. In recent years, with the in-depth study of tea science, chemistry and pharmacy, it has been proved that some components of Qingshan Green Water Tea are similar to tea, such as chlorophyll, polyphenols, free amino acids, vitamins and a small amount of alkaloids, which can eliminate free radicals in human body, prevent fat oxidation and resist aging. In green mountain green water tea, the content of zinc is more than twice that of green tea (zinc is the active center of hundreds of enzymes, and it is also an insulin component, which is one of the essential trace elements for human body and can enhance human immune function), and the content of selenium is more than 20 times that of green tea (selenium is an important component of brain nerves, and regular selenium supplementation can alleviate brain fatigue). According to the research on the natural components of green mountain and green water tea by Kunming Institute of Botany, Chinese Academy of Sciences, green mountain and green water tea contains eight essential amino acids, among which the content of flavonoids is 1.37%~2.63%, which is 0.38%~ 1.74% higher than that of green tea (flavonoids can maintain the normal osmotic pressure of blood vessels, reduce the fragility of blood vessels and inhibit the growth of cancer cells). The caffeine content of green mountain and green water tea is much lower than that of green tea, and it will not be addictive, excited or insomnia after long-term drinking. Lu Xun said: "What is good tea? A little bitter is good tea! "