Clan concept comes from patriarchal society and expresses as family name. Clan has had important influence on Chinese society. The family name Li appeared in Longxi of North China more than a thousand years ago, and became the royal family name in Tang Dynasty, thus greatly increased the influence of this family name. Ancestral Hall of Li was build in Longxi for clan affection and the place name of Longxi became a cultural symbol for all the Li family members in the world, the genealogies connect different branches together and the place is now an important link to promote Chinese culture.