1. According to the name, the Forbidden City is also called the Forbidden City. In ancient China, the planning concept of "harmony between man and nature" was emphasized, and the stars in the sky were used to correspond to the capital planning, so as to highlight the legitimacy of political power and the supremacy of imperial power. The Emperor of Heaven lives in Wei Zi Palace, and the emperor on earth claims that he is the "son of heaven" ordered by God. His residence should be a symbol of Wei Zi Palace, so as to conform to the Heaven Emperor. The Book of the Later Han Dynasty records that "there is a Wei Zi Palace in the sky, which is the residence of God". The king built a palace and liked it. "

2. Construction principle: The Forbidden City is built in strict accordance with Zhou Li's test of Gong Ji's principle of "the former dynasty was in the city, and the left ancestor was in the right society". The whole Forbidden City, in terms of architectural layout, is combined into a whole through the changes and ups and downs of its shape.

In the process of construction, Beijing was originally the fief of Judy, the prince of Yan. After the war of Jingnan, in the first year of Yongle (1403), Li Zhigang, an official of the Ministry of Rites, said that Yanjing Beiping was the emperor's "land of dragon's prosperity" and should follow Ming Taizu's example and take Fengyang as its capital. Therefore, Ming Taizu Chengzu vigorously promoted the position of Beiping House in Yanjing, taking Beiping as Beijing and changing Beiping House into Shuntianfu, which is called "in the line".

4. During the Ming Dynasty, after the completion of the Forbidden City, the court history of the Ming and Qing Dynasties lasted for more than 500 years, including activities after the emperor, hierarchy, power struggle, religious sacrifices and so on. In the 18th year of Yongle (1420), Beijing Palace was completed. The following year, a fire broke out and the first three halls were burned down.