The theory of family language planning applies Sposki's language policy theory to the family level, consisting of three parts: language awareness, language management, and language practice. This theory focuses on the roles and connections of these three factors within the family language domain, integrating language inheritance, bilingualism/multilingualism, and child language acquisition research. The research methods are mainly divided into qualitative and quantitative methods. Narrative shift method, as one of the qualitative research methods, analyzes the narratives of the respondents to understand their language practice, consciousness, and socialization process. The narrative turning methods include important event analysis, "short story" analysis, and moment analysis, focusing on the experiential content of the interviewee, especially micro and fleeting experiences. Researchers trace and guide respondents to recall through interviews, capture detailed information, analyze respondents' language practices and the reasons that affect their language ability development and changes. The analysis of interview information focuses on the experiential content of the interviewee. Researchers analyze narrative data from the interviewee's perspective based on the principle of reflection, organize interview information in chronological or logical order, describe the interviewee's experience, and organize and display it by theme. By analyzing and organizing specific interview data, researchers can more comprehensively analyze the components, relationships, and roles of the family language planning framework.