It is precisely because of the uncertain nature that floating clouds have the possibility of symbolizing wandering wanderers. Metaphor is erratic and has no fixed place to live. Li Bai's "Farewell to Friends" said: "I want to think of you in the clouds, so I think of me in the sunset". A white cloud floats in the sky with the wind, symbolizing my friend's arbitrary going west and east; The "sunset", which descends slowly and can't bear to leave the earth suddenly, symbolizes the poet's reluctance to his friends. Wei, a poet, combined extremely long time, extremely wide space and extremely complicated personnel, and wrote "After ten years of running water, all ends well" ("Reunion of Old Friends in Liangzhou"). This sense of vicissitudes of life can also be felt in Huang Tingjian's "Peach, Plum, Spring Breeze, A Glass of Wine, Ten Years in Yi Deng" ("Send Yellow Several Times"). Because of the freedom of floating clouds, I have obtained the qualification to express my leisure personality and comfortable life. There is a saying in "Gui Xi Ci" that "the clouds come out of the hole unintentionally, and the birds are tired of flying to know", which shows Tao Qian's rare innocence and truthfulness in the adult world, never violating his personality and adapting to foreign things. Wang Wei's "I will go to the water to stop my path, and then sit and watch Yun Qi" ("My retreat in Zhongnanshan") highlights the poet's simple nature, detached style, unrestrained, flying freely like a cloud, flowing freely like running water. Liu Zongyuan's "I turn around and see the waves moving like the sky, the clouds on the cliff are idle, one by one" ("Fisherman") not only inherits Tao's poems, but also embodies his own personality, situation and pursuit. Because clouds come and go suddenly, it is used to express fleeting things, and it is also extended to things that are not easy to achieve or unwilling to achieve. As early as the Analects of Confucius, there was such a saying:' Eat less and drink more, bend your arms and rest on it, and enjoy it. Unjust wealth is like a cloud to me. ""Use floating clouds to describe unreasonable wealth. Du Fu said in "A Gift from Dan Qing to General Cao Ba": "I am loyal to my art, I don't know my age, and I let fame and fortune drift like clouds", which shows that General Cao is addicted to Dan Qing and doesn't know that his old age is coming, and his sentiment is noble, he doesn't care about fame and fortune, and he regards fame and fortune as a cloud in the sky. "I waved my sleeve and didn't take away a cloud." In A Farewell to Cambridge by Xu Zhimo, a poet of the Crescent School, the "cloud" lingers enthusiastically in front and follows reluctantly behind, which is so beautiful and attached. "There are some clouds in the sky and some breeze blowing on the ground. Ah! The breeze blows my hair and teaches me how to miss her? " Liu Bannong's Love Song begins with Wei Yun and the breeze, expressing his deep yearning for the motherland. The "floating" of floating clouds means floating on the surface and shielding foreign objects, so it means the invasion, corrosion and obstruction of external bad factors and improper personnel. In the first poem of Nineteen Ancient Poems, there is a sentence "Go again" and "Clouds cover the sky, and wanderers don't care about rebellion". This "floating cloud" has become a temptation or injury to her husband by outsiders in her heart, and it has become a lingering melancholy cloud. Li Bai's "A cloud rose between the light in the sky and me, hiding his city in my melancholy heart" ("Going to Nanjing to climb the Phoenix Tower") is meaningful. Chang 'an is the seat of the imperial court, and the sun is the symbol of the emperor. Lu Jia's "Shen Xinyu Micro-essay" said: "Evil ministers cover up the virtuous, just like clouds cover up the sun and the moon." These two poems imply that the emperor is surrounded by evil spirits, but he can't serve the country, and the poet's sad mood is hidden in it. Because of obstacles, many people break through them. "Since ancient times, autumn is sad and lonely. I say autumn is better than spring. The cranes in the clear sky row clouds, bringing poetry to the blue sky (autumn words). The "clear sky crane" in Liu Yuxi's poems is the embodiment of indomitable spirit and the spirit of struggle. Wang Anshi's poem "Don't be afraid of clouds to cover your eyes, but your eyes are high and your eyes are low" shows the tolerance of an outstanding politician and his confidence in himself and his career. Chen Yi, a revolutionist of the older generation, said that "the clouds will eventually cover the sun, and winter will go and spring will bud", which showed his firm belief in breaking through obstacles, overcoming evil and heading for victory.