Abstract: YAN Zhi-tui lived in the social transformation period from the end of the North and South Dynasties to the unity of Sui Dynasty.As a linguist,he focused on the development and changes of language and words under certain social circumstances academically,devoted to the research and application of normalization of language and words and laid the theoretical and applied foundation for the normalization of language and words in Sui and Tang Dynasties.His descendants followed his suggestions,inherited the tradit...