Language policy research is an interdisciplinary field that involves linguistics, political science, sociology, anthropology, and more. Ethnographic methods have received attention due to their close proximity to real society and their roots in specific contexts. Researchers explore through ethnographic research how language policies affect language life in schools, communities, and families, as well as how policy implementers participate in policy interpretation and implementation. Ethnographic writing is based on long-term participatory observation, where researchers gain social identity within the community and understand the perspective of insiders. The epistemological foundation of ethnographic research is the constructivist view of knowledge, emphasizing the multi reconstruction of knowledge. The theoretical perspective is interpretivism, emphasizing the description and interpretation of events. Ethnographic researchers use various research methods, such as participatory observation, interviews, etc., to present the complexity of reality. Confucius' principle of 'observing one's actions while listening to their words' is the key to ethnographic research, emphasizing the observation and recording of speech and behavior. Language analysis methods such as critical discourse analysis and narrative analysis are used for text analysis, while deep description and performance theory are used for describing communicative behavior. The combination of critical discourse analysis and ethnography provides an analytical foundation for policy contextualization. The study of language policy ethnography provides decision-makers with real-life cases and promotes scientific policy-making.