The gates of Beijing quadrangles are all in the southeast corner (left front corner), called Qinglong Gate. Feng Shui calls this layout Kanzhai Gate, which is the most auspicious. In geomantic omen, leaning against the back wall is the most taboo, and it is not appropriate to open the middle door, for fear of being discouraged. Therefore, none of the back doors of Beijing quadrangles open in the middle of the back wall. Feng Shui is a kind of spiritual domination and psychological comfort. Because of the clan system and the deterrent effect of Feng Shui, people are afraid of an external force. Zhouyi: "The saints use Shinto, and the world is smooth." Book of Rites: "A hundred people are afraid, and ten thousand people are convinced." Afraid, so convinced. Living in a quadrangle explored by geomantic omen, people are psychologically satisfied and practical. If they violate Feng Shui, people will feel uneasy.
Another setting for resolving external evils in quadrangles. Ten Books of Yang Zhai describes the bad luck in the house: "There are many ways to build a house, but there is no way. Houses in the house, such as glans penis, goose tail, Dai Xiao, etc. If they commit a crime, they should be seriously hurt. " B3 1 means that if there are two forms of "glans penis" and "goose tail" in the house at home, there will be terrible disasters. From an aesthetic point of view, the forms of "glans penis" and "goose tail" lack a square atmosphere, so it is inevitable that the Kanyu family will be judged unlucky. If the divination of the house owner in geomantic omen is inconsistent with the divination of the house or the location of the quadrangle is not ideal, use the porch or screen to melt the evil spirit. The space at the entrance of the courtyard is called the porch, and the biggest feng shui function of the porch is to dissolve the "suffocation" of the street leading to the gate. For example, the gate is considered to be unfavorable to the main roads and corners, so setting the entrance can change the direction of "external air" and avoid misfortune. At the same time, the porch plays a role in covering up and beautifying the environment.
Beijing City was planned by the designers according to The Rites of Zhou, while Miyagi, the Central Axis, Li Fang and Hutong were planned and implemented in strict accordance with the law. But at the same time, it is also dominated by the thought of Zhouyi, which contains a lot of feng shui factors. Siheyuan was designed under the control of feudal hierarchy and geomantic factors. In real life, Zhou Li and Zhou Yi are mutually infiltrated and coexist.