The location of the Forbidden City is the best in Beijing, where all three halls are located, that is, Tang Ming, which is located in the center of the world, corresponding to Wei Zi Palace, where the central emperor of China lived.
When the Forbidden City was completed, there were no Jinshui River and Long Live Mountain (later renamed Jingshan). Based on the consideration of feng shui pattern, setting Xuanwu Gate (later renamed Shenwumen) in the north of the Forbidden City violated the taboo that the ancients should not open the door in the north and then build mountains as a barrier. Long live the Mountain and Tianshou Mountain of the Ming Tombs echo each other from a distance, and the Long Mai spirit of Tianshou Mountain is introduced into the Forbidden City, which not only becomes the town mountain of the Forbidden City, but also prevents the north wind from passing through the hall. Jinshui River comes from the north of Long Live Mountain and flows into the moat of the Forbidden City along the foot of Long Live Mountain. The river is introduced into the Forbidden City from the northwest corner downstairs and flows into front of the Hall of Supreme Harmony. In the eight diagrams, north, west and north belong to the dry position, representing Tianmen, so the ancients gave Jinshui River a beautiful fable: the water from Tianhe introduced the vitality of the sky into the Forbidden City through the flow of Jinshui River.
The layout of the Forbidden City strictly follows the principle of symmetry of the central axis, and the buildings at both ends of the central axis are symmetrical. The central axis is the central meridian, which is the baseline for planning the Forbidden City and all palaces in Beijing. The three main halls of the Forbidden City, namely Fengtian Hall, namely Fengtian Hall, Gaihua Hall, Shenshen Hall (later renamed Taihe Hall, Zhonghe Hall and Baohe Hall) and Logistics Palace (Gan Qing Palace, Jiaotai Palace and Kunning Palace) are all located on the central axis. If other palaces are not built on the central axis. It is also arranged in strict accordance with the symmetry rules and distributed at both ends of the central axis.
At present, the construction of Beijing Olympic Village is also in line with the principle of axis symmetry.