Compare the layout similarities and differences between Chang 'an in Tang Dynasty and Beijing in Ming Dynasty.

Chang 'an City in Tang Dynasty was generally symmetrical with the central axis, and the layout of Yecheng and Luoyang City in Han and Wei Dynasties was referenced in the design. In the process of urban construction, the book of changes and six hexagrams are added, and buildings with different functions are arranged according to the characteristics that Longshou Plateau is divided into six slopes. In addition, planning a garden area on the edge of the city can not only beautify the environment, but also become a place for people to visit, which is a great initiative in the history of ancient cities in China.

Five lines of gossip Thought was embodied in Beijing in Ming and Qing Dynasties. In strict accordance with the layout of the stars, China divided the center of the sky into three walls: Qiu, Wei Zi and Heaven and Earth. Ziwei Garden is in the center, where the Emperor of Heaven lives. The Ming emperor named this palace "Wei Zi Palace" (hence the name of the Forbidden City). At that time, the architect arranged the largest Fengtian Hall in the Forbidden City (later called the Hall of Supreme Harmony) in the center for the emperor to use. Fengtian Hall, Gaihua Hall (Zhonghe Hall) and Shenshen Hall (Baohe Hall) symbolize Tianque Sanyuan. The three royal Highnesses set up three steps to symbolize the "three episodes" of stars under the cliff of Taiwei. The above is the "front yard", which belongs to Yang. According to the mathematical theory of even yin and odd yang, there is a system of "the first three halls", "three dynasties and five doors" in the yang area, and a pattern of "six palaces and six bedrooms" in the yin area.