Tea tree, formerly known as tea, Latin scientific name: Camellia sinensis (L.) O. Ktze, a shrub or small tree of Camelliaceae and Camellia, with hairless shoots. Leaves leathery, oblong or oval. Tea leaves can be used to make tea (different from camellia oleifera), seeds can be used to extract oil, and the material of tea trees is fine, and its wood can be used for carving. The distribution is mainly between south latitude 16 degrees and north latitude 30 degrees. Tea trees like warm and humid climate. When the average temperature is above 10℃, the buds begin to germinate, and the optimum temperature for growth is 20 ~ 25℃. The annual precipitation should be above 1000 mm; Like light and shade, suitable for childbirth under diffuse light; Life is divided into seedling stage, adolescence, adulthood and old age. The tree age can reach 120 years, but the economic tree age is generally 40 ~ 50 years. Southwest China is the origin center of tea trees. At present, tea trees have been introduced to 60 countries in the world. In the tropics, there are also arbor tea trees as high as 15-30m, with a base circumference of more than 1.5m and a tree age of hundreds to thousands of years.