1) records the historical data of family lineage and related contents, involving the origin of surnames, family migration paths, family rules, etiquette and customs, etc. , is a powerful supplement to historical documents (official data only record historical events and important people).

2) The role of ties: enable people of the same pedigree in different regions to recognize their ancestors and even return to their ancestral homes, thus enhancing social and national cohesion.

3) People with genealogy have a high status in the family and are cohesive to the whole family; There are family rules and regulations in the genealogy, which is beneficial to the family to maintain consistent cultural customs for a long time;

3) According to surnames, it is meaningful for modern scientific research such as consanguinity, heredity and DNA to understand the process of national evolution (when people of which nationality get married).