The value of genealogy documents as historical literature is controversial because of the fabricated information about ancestors and family history,but the value as cultural memory medium has been recognized in the area of Historical Anthropology. The author made investigation about how the researchers use the genealogy documents as cultural memory medium and found the difference between the research of genealogy documents for memory and for history. The author tries to locate more accurately the target users and typical application scenes of genealogy documents, and then put forward new ideas and ways for institutions to re-recognize the value of genealogy documents and develop the content deeply. The author provides an use case about the research of immigration history of Macheng,Hubei province by transforming the textual abstracts to semantic data which is easy to compute for statistics and analysis, and tries to find some new research questions or answers.