Abstract: Category is static and dynamic. Although the traditional study in category has some normal forms, it also has large fault, which only pays more attention to establishment, and not care the dynamic of the category. Under the category of language, the paper discusses the dynamic changes of semantics, which can get new evidence for the dynamic in category, at the same time, it can improve the study in category. The paper takes categories in Chinese and English for examples, and systematically analyses the dynamic changes of semantics and the change in semantic function, which reveals a dynamic systemic in language-category.