Genealogy, also known as genealogy, genealogy, family riding and so on. It is a special file, which records the name of a family and reflects the history of a family. The contents include lineage, world table, origin, sects, letters patent, images, biographies, tomb notes, tomb maps, epitaphs, ancestral temples, temple rules, family rules, family precepts, family rules, Yi Tian, Zhuang Yi, art, works, etc. It is an important material for studying social structure, patriarchal clan system, sociology, demography, local chronicles, national history, family history, history of expatriates, historical figures, literary and artistic creation, etc.