Geomantic omen theory is the knowledge related to architectural environment planning in ancient China. Its main content is the principle of comprehensive evaluation of various environmental factors such as topography, landform, landscape, climate and ecology to choose the construction site, and puts forward some guiding opinions on architectural planning and design, explaining which should be pursued and which should be taboo. People who master this subject and take it as their profession are called Feng Shui. The word "Feng Shui" comes from the cloud in Guo Pu's Funeral Scripture, that is, "Qi dissipates by wind, and water stops at the boundary", that is, "Anger" related to topography and topography has the greatest relationship with Feng Shui-avoiding the wind and liking the water, so the wind should be hidden and the water should be gathered. Only by "hiding the wind and making water" can the anger be strong. Feng Shui experts call the land with a good building environment a "treasure house of Feng Shui" and think that such a place must be full of vitality.
It can be said that Feng Shui theory originated from early human settlements. As early as the turn of the Paleolithic Age and the Neolithic Age, when the capture economy of gathering and hunting was replaced by the production economy of agriculture and animal husbandry, the relatively stable settlement life began to need to pay attention to the choice of living environment. From primitive villages such as Peiligang, Banpo and Jiangzhai, or public buildings such as Dadiwan House and Dongshanzui Altar, we can see people's consideration of site selection in Neolithic Age. The long-term accumulation of this experience has developed into a technique of mutual restraint in the pre-Qin period. Geomantic omen, also known as geomantic omen theory, is a popular method in ancient China, instructing people how to choose the location and orientation of houses and graves and determine the time of construction. After physiognomy developed into geomantic omen, it affected the planning, layout, design and construction of buildings to a certain extent, mainly among the people, followed by the government, which was widely circulated and had far-reaching influence.