In a large number of classical literary works, there are also descriptions of improving and protecting the environment, reflecting the importance that the ancients attached to environmental protection. Tao Yuanming, a poet of the Jin Dynasty, was fond of planting willows. After resigning from office and going into seclusion, he always remained friends with willow trees. He also deliberately planted five willow trees in front of his house, calling himself "Mr. Five Willows". He wrote many poems about his love for the trees: "The elms and willows shade the back eaves, and the peaches and plums in front of the hall", "The orchid lingers under the window, in front of the dense hall. Liu" and so on. When Du Fu, a poet of the Tang Dynasty, lived in a thatched cottage in Chengdu, he never forgot about greening all year round. He also wrote poems in letters and asked friends for saplings: "The few flowers in the thatched cottage are about to be planted now, regardless of green plums and yellow plums. But in the stalagmite street, they returned, and in the orchard room Su Shi, a great writer in the Song Dynasty, also loved to plant trees. "When I was young, I planted pine trees all over Donggang. The roots were as small as transplanting rice seedlings." This is a description of the scene when he planted trees. Later, when he became an official in Hangzhou, he built a long embankment and "planted hibiscus and willows on it, making it look like a painting", which became one of the beautiful sights of the West Lake. Wu Cheng'en of the Ming Dynasty also described harsh environments such as the Flame Mountain and their transformation in "Journey to the West", and punished Wuzhuang Temple for destroying ginseng and fruit trees and other destructive behaviors to nature.