Three words and two beats were two literary forms in ancient China. They were the Song of Everlasting Regret by the Tang Dynasty poet Bai Juyi and the Song Dynasty poet Liu Yong's Yu Linling. These two literary forms had the following characteristics: 1. Rap form: Sanyan and Erpai are both rap literature that is spread in oral form. They use rap to express the story and plot through lyrics, with distinct spoken language characteristics and rhythm. 2. Narration characteristics: The three characters and two beats are narrative poems that use narration as the main way of expression to describe the experiences, emotions, and events of the characters to show profound social reality and human philosophy. 3. Thematic features: The three characters and the two beats both involve social reality and human nature, including love, marriage, family, power, desire, etc. They have distinct characteristics of the times and cultural implications. 4. artistic features: San Yan and Er Pai both pay attention to musicality and rhythm, enhancing the appeal and expressiveness of the work through musical rhythm and rhythm. At the same time, they also paid attention to the innovation of language and literary forms, and displayed their unique artistic charm through unique language styles and literary techniques. To sum up, Sanyan and Erpai have distinct oral characteristics, narrative characteristics, theme characteristics and artistic characteristics. They are the representative works of ancient Chinese rap literature and have important literary history status and artistic value.