Introduction to Yunnan yew: Yunnan yew, also known as Southwest yew, is an evergreen tree of the genus Taxus in the family Taxaceae and one of the four species of yew in China. It can reach a height of 20 meters and is dioecious. It has lush foliage and strong vitality, and a single tree can be more than a thousand years old. The bark is grey-brown, grey-purple or lavender-brown, split into scaly flakes and falls off; the leaves are thin and soft, strip-lanceolate or lanceolate, often in the shape of a curved sickle. The male cones are light brown and yellow, and the seeds are born in fleshy cup-shaped arils, which are oval and oval in shape. The arils are red when mature. Yunnan yew is a precious tree species in Yunnan Province and a first-level key protected tree species in Yunnan Province. It is the main tree species used in the production of paclitaxel drug in China. Produced in northwestern and western Yunnan, southwestern Sichuan and southeastern Tibet, it grows in high mountain areas with an altitude of 2000-3500 meters. It is also distributed in Bhutan and northern Myanmar. Its material is excellent and can be used in construction, furniture, appliances, etc. Its extract paclitaxel has anti-cancer effects. It is a precious tree species that integrates timber, medicinal and greening uses.