The term "National Day" originally refers to the celebration of the country and was first seen in the Western Jin Dynasty. Lu Ji, a writer in the Western Jin Dynasty, once recorded in the article "On the Five Classes of Princes" that "National Day enjoys its own advantages, and the main worry is not to be harmed". In the feudal era of China, the major events of the country's festivities are no greater than the emperor's ascension to the throne and his birthday. Wait. Therefore, in ancient China, the emperor's accession to the throne and his birthday were called "National Day". Today the anniversary of the founding of the nation is called National Day.