Preface to Mao Shi was an important literary theory work in the history of Chinese literature. The author was Han Yu, a writer of the Tang Dynasty. The preface of this article mainly reflects some of Han Yu's views on poetry creation and poetry theory, including the following aspects: 1. Oppose the utilitarians of poetry: Han Yu believes that poetry should be a pure art form and should not be endowed with any utilitarian purpose. He emphasized that poetry should be a poet's means of entertainment, not for social status or economic benefits. 2. emphasize the lyricism of poetry: Han Yu believes that poetry should have the lyric characteristics, so that readers can feel the emotions and thoughts of the poet in the process of reading. He emphasized the importance of emotional expression and artistic conception in poetry. 3. Admire the simplicity and brightness of poetry: Han Yu believes that poetry should pursue a simple and bright style and avoid long and complicated expressions as much as possible. He emphasized that poetry should express profound thoughts in concise and concise language so that readers could feel the charm of poetry in a short time. 4. Advocates the realism of poetry: Han Yu believes that poetry should have the spirit of realism to reflect social reality and people's lives. He emphasized the realism and authenticity of poetry and believed that poetry should reflect social reality and people's lives through true description and profound thinking. Han Yu's Preface to Mao's Poetry mainly reflected his views on poetry creation and poetry theory, emphasizing the lyricism of poetry, the concise and bright style, and the spirit of realism, advocating the truth and profundity of poetry. These views had a profound impact on the later Chinese literary theory and poetry creation.