The score is divided into metaphors and comparisons. The characteristic of analogical poetry is that it uses another thing to write about this thing. The things described in the poem are not the actual objects that the poet wants to sing about, but use metaphors to express the poet's thoughts and feelings. Xing, that is, rising, at the beginning of a poem or a chapter of poetry. People often clearly separate the two expression techniques of Bixing and Xing. In our research, we believe that the two expression techniques of Bixing are not completely separate. There is a certain connection in some poems. For example, in "Meng", natural phenomena are used. To describe the changes in the heroine's emotional life, the verses of "Xing" are used to introduce the poems expressing the emotional life. From the freshness of the leaves to the withered yellow, it is a metaphor for the happiness and pain of the emotional life. The "Xing" here has the function of comparison. Xing plays an extremely important role in poetry. Without it, poetry will lose its aesthetic value and appeal.