1, geomantic theory: In the traditional culture of China, geomantic theory is widely used in architecture and urban planning. According to Feng Shui theory, the orientation and location of a house can affect the fortune of a family and the happiness of residents. The southeast gate is considered to be a more auspicious location, which can bring good luck and wealth. Therefore, the four main rooms can only stay at the southeast gate, which is due to the consideration of Feng Shui theory.
2. Historical reasons: In ancient times, China's architecture and urban planning were influenced by etiquette and religious beliefs. In the ritual system, there are strict regulations on the orientation and location of houses, and the southeast gate is regarded as aristocratic orientation, which can only be left to the first house.
3. Geographical environment: In some areas of China, due to the limitation of geographical environment, the southeast gate is indeed the most suitable place to leave the gate in the main room. For example, in some mountainous areas, due to the terrain, the southeast gate is more suitable as the entrance of the main house than other directions. So there are four reasons why the four main rooms can only stay at the southeast gate.