2. The terrain of the land is Gao Shuang and sunny, the groundwater level is low and the ground should have a certain slope.
This is conducive to drainage, moisture-proof, keeping the ground dry, enhancing the anti-corrosion ability of the house, while keeping the environment clean and reducing the breeding grounds of flies and mosquitoes. If the terrain conditions are not ideal, artificial improvement can be made. Many old villages are built by mountains and rivers, and the rainwater on the mountains falls down the slope (that is, the "shower head water" in geomantic omen). Some of them are collected by ditches, and some of them seep into the ground and invade the walls of houses. The room is very humid, people will get rheumatic diseases if they live for a long time, and the incidence of rheumatic heart disease, tonsillitis and pharyngitis will increase seriously. In this case, a deep ditch can be dug around the house to drain water and improve the environment.
3. Houses should try to avoid areas where railways, highways and high-voltage transmission lines pass, and also avoid places where underground resources or important historical sites have been proved to be exploitable.