Through the study of the most "boring and tedious" of "personnel information such as the life and death of individuals" of the W Clan'genealogies in New Territories,Hong Kong,Masahisa Segawa(濑川昌久)has raised some "fundamental questions" that are close to the level of the program of genealogy:"What meaning do people find in recording the contents of their genealogies?" What meaning do people find in recording the contents of their genealogies?What is the value of the information that constitutes the content that is consistently recorded on?How do people discover clan from genealogy?"He" hopes to elucidate the non-obvious consciousness of the subject of genealogical compilation and the people with whom it is recorded about the passage of time and continuity beyond time by explaining what kind of document genealogy is and what people's purpose is in recording genealogy."The Japanese anthropologist's sense of problem and research method is an important practice of seeing the reality of the clan from the genealogy and returning genealogical research to the genealogy itself,which deserves great attention from Chinese genealogy readers and researchers.