The term "National Day" originally refers to national celebrations and was first seen in the Western Jin Dynasty. The writer Lu Ji of the Western Jin Dynasty once recorded in his article "On the Five Classes of Princes" that "National Day alone enjoys its benefits, the main concern is not its harm". China's feudal era and national festive events are more important than the emperor's enthronement and birth. Wait. Therefore, in ancient China, the emperor's ascension and birthday were called "National Day". Today, the anniversary of the founding of the country is called the National Day.