Abstract: The article is an analysis of the lexico-semantic group, which is an important part of the study of semantics. The relevance of the research topic is due to the great research significance and value of studying linguoculture in various national language pictures of the world. The day as a part of time is the main key concept for the study of time, and the study of time for the analysis of differences and similarities between the language and culture of different countries and peoples has become a hot topic for scientists of the linguistic community. The purpose of the work is to consider the specific differences and similarities between the lexemes "day" of the Russian and Chinese languages by highlighting the lexico-semantic group. The article also analyzes the term "day" in order to identify differences in the linguistic worldview of different nationalities. As the main methods of analysis and research, the component method was used, which allows a deeper and more detailed interpretation of the lexeme "day" and its lexico-semantic group in two language pictures of the world. The scientific novelty of the work is to identify the differences and similarities between the Russian and Chinese languages and culture through the reflection of various details and a detailed analysis of the lexico-semantic group with the allocation of the "measurement of time", "movement of the sun and moon", "human activity" in it. The differences and similarities in the perception of time by a person in different linguistic pictures of the world are demonstrated.