Since ancient times, China has a tradition of paying attention to customs. "For government, we must study customs first" and "observing customs, knowing gains and losses" are the ancestral teachings that successive monarchs scrupulously abide by. The supreme ruler should not only personally investigate the customs and people's conditions, but also appoint officials to investigate the folk customs, take it as an important reference when formulating national policies, and record it in the annals of history by historians, so as to leave the experience of Governing Customs for future generations.