The role of salt in geomantic omen is to ward off evil spirits, change fortune and purify the whole house, which means that the environment in the house can be better. Salt is one of the most important substances to sustain human life. It flows in the blood in the form of sodium. In geomantic omen, salt has a strong positive effect, which can absorb qi energy, dispel wind and dehumidify, and is conducive to purifying and stabilizing the environment. The condensed gas energy of salt comes down in one continuous line with the five elements of gold. From a scientific point of view, salt has the function of sterilization and disinfection, so the salt with enlarged particles is good for the living environment.