The difference between pre-Qin literature, Tang and Song literature, Yuan, Ming and Qing literature and other later literatures lies in the different times of creation and the different thoughts of the times they reflect. Pre-Qin literature refers to the literature of the Qin Dynasty, the first recorded dynasty in Chinese history, from the 7th century BC to 221 BC. The literature of this period is mainly reflected in ancient classics, ancient literary theory, and ancient Guo's works. Representative works of pre-Qin literature include "The Book of Songs", "Shangshu", "Book of Changes", "Book of Changes", etc. Tang and Song literature refers to the literature of the Tang and Song Dynasties in Chinese history from 618 AD to 1279 AD. The literary styles of this period were varied, with representative works such as "Journey to the West", "Water Margin", "Hongshi Zhuan" and "The Analects of Confucius". The literature index of Yuan, Ming and Qing Dynasties is the literature of the Yuan, Ming and Qing dynasties in Chinese history from 1279 AD to 1911 AD. The literary style of this period was also very varied. Representative works include "Three Kingdoms, Lu Wu", "The Romance of the West Chamber", "Song of Everlasting Sorrow", etc. Yuan, Ming and Qing literature refers to the literary works of China's Yuan Dynasty (1271 to 1368), Ming Dynasty (1368 to 1644), and Qing Dynasty (1644 to 1912). The literary works of this period reflect the diversity and depth of Chinese culture, including many excellent poems, novels, dramas and essays. The literary works of this period also reflect the political, social and cultural background of this period.