There are many ancient trees with thousands of years' history in China. It has gone through many vicissitudes, the baptism of war and the long years when the world is changing. It is still ancient and full of vitality, adding a lot of brilliance to the ancient and splendid culture and magnificent mountains and rivers of the socialist motherland. Protecting and studying ancient trees is not only because it is a unique natural and historical landscape, but also a witness to the historical development of human society. It is of great scientific value to the study of ancient plants, paleogeography, paleohydrology and ancient history and culture.

(1) Ancient and famous trees are the witness of history.

The ancient and famous trees in China are not only widely distributed horizontally, but also span several dynasties vertically, and they are very old. For example, China's legendary Bai Zhou, Qin Song, Han Huai, Liang Meiwei, Tang Xing (Ginkgo biloba) and Zhang Tang can all be used as historical witnesses. The "Ginkgo King" in Fulai Mountain, Ming County, Shandong Province has a history of more than 3,000 years. The "Bai Zhou" in Jinci, Taiyuan, Shanxi has a history of more than 3,000 years. Two ancient white pine trees, Wenguo Temple in Chang 'an County, Shaanxi Province and Jietai Temple in Beijing, are over 1.300 years old and are the oldest trees in China and even in the world.

(2) Ancient and famous trees add luster to culture and art..

Many ancient and famous trees have been dumped by scholars and bachelors in past dynasties to express their feelings. It plays a unique role in the history of culture. For example, Shan Li, one of the eight eccentrics in Yangzhou, once had a famous painting "Five Song Fu", which was an artistic representation of the famous trees in Mount Tai. There are many such paintings for ancient trees, which are treasures in China's cultural and artistic treasures.

(3) Ancient and famous trees are the best scenic spots of historical sites.

Ancient and famous trees have the same landscape value as landscape and architecture, and are important scenic tourism resources. It is vigorous and colorful, embedded in famous mountains and temples, integrated with mountains and rivers, ancient buildings and gardens, attracting people to visit and watch. For example, the "Kowloon cypress" in Beijing Tiantan Park, the "Yin Hou" in Beihai Park and the "Lie" in Mount Tai.

Longsong ",the four ancient cypresses of Suzhou Guangfu" Qing, Qi, Gu and Qi "... they decorate the mountains and rivers of the motherland more beautifully.

(4) Ancient trees are of special significance to the study of tree physiology.

Trees have a long growth cycle, but people's life span is much shorter. We can't study the law of its growth, development, aging and death by tracking. The existence of ancient trees shows the time sequence of tree growth and development as a spatial arrangement, so that we can take trees of different ages as the research object and find the general law of this tree from birth to death.

(5) Ancient trees have great reference value for tree species planning.

Most of the ancient trees are native trees, and the ancient trees preserved so far are living cultural relics that have experienced vicissitudes, which can be proved to be highly adaptable to local climate and soil conditions on the spot. Therefore, investigating local cultivated and suburban wild tree species, especially ancient and famous trees, can be used as a reliable reference for making urban tree species planning.