In the teaching practice of classical literature, Qi Gong wrote On the Rhythm of Poetry and Prose, and made a pioneering study on the rhythm of poetry and the characteristics of Chinese, and achieved fruitful results. He also wrote On Poetry. There are unique insights in On Poetry, such as On the Whole: "Before the Tang Dynasty, poetry was the second longest, and at the time of the third Tang Dynasty, it was full of vigor and vitality. Every sentence of Song is thought-provoking, and the following is all based on imitation. " He gave lectures to students and said in his notes summarizing the characteristics of poetry in past dynasties: "The servant said that poetry was born before the Tang Dynasty, Tang poetry was called out, Song poetry was conceived, and poetry after the Song Dynasty was imitated. Those who yell are justified, while those who scold are unintentional. Thinker, thoughtful, thoughtful. " This paper makes a thorough analysis of the development history of poetry for thousands of years, which has great inspiration for the later young people to learn.