Chedian is a famous sentence of Du Fu, which has been highly praised by all dynasties. It reveals that the long-term military struggle of Xuanzong in Tang Dynasty brought great disasters to the people, which has profound ideological content. It is also outstanding in art, first of all, it contains feelings in the narrative. This narrative poem, whether described in the previous paragraph or passed down from generation to generation in the latter paragraph, naturally runs through the whole poem with the poet's strong and profound thoughts and feelings, and the image of the poet's anxiety seems to be displayed in front of the readers. Secondly, in the narrative order, the ups and downs echo before and after, comfortable and affordable, changeable and orderly. In the first paragraph, people are crying in Ma Si, and the noisy atmosphere is rolling with dust, paving the way for the second paragraph to talk about their difficulties; The long narrative in the second paragraph further deepens the ideological content of the scene description in the first paragraph, which reflects each other and complements each other. At the same time, the development of the plot is closely combined with the transformation of sentence patterns and rhymes. With the narrative, sentence patterns and rhymes are constantly changing, and the use of three, five and seven words strengthens the expressive force of poetry. For example, the first two or three sentences are urgent and exciting. Later, in a large section of seven words, eight five words were suddenly interspersed, showing the irresistible passion of "pedestrians", which was particularly vivid. In terms of rhyme, the whole poem has eight rhymes, four levels and four levels, alternating with each other, cadence and emotion. Thirdly, turning sentences and idioms are used in the narrative, such as "and every time a bystander asks you a question, you can only tell him that you are leaving" interspersed in the long narrative. No matter what demands are made on them, do they dare to complain? ? And "I don't see you" and "I don't smell you" not only avoid lengthy monuments, but also constantly remind and arouse readers, resulting in thrilling artistic effects. The poet also adopted the word connection of folk songs, such as "They run after you, crying, they pull your sleeve, and their plaintive voice goes up to the clouds". And every time a bystander asks you a question, you can only tell him that you are leaving. They all came down one by one like pearls. Read it out loud, sonorous, harmonious and beautiful. Finally, the use of common spoken language, such as "Ye Niang's wife", "They run with you, cry, and they pull your sleeve" and "But their officials drive them to make trouble", is fresh and natural, which is a very prominent one in Du Fu's poems. In response to this comment, predecessors once said: "Miscellaneous ballads are the most susceptible, and the shallower they are, the more incisive they are." The use of these folk songs adds vivid and cordial appeal to this poem.