The "sha" in Feng Shui is a general term, which is a name used by Feng Shui masters for the unfavorable factors in residential Feng Shui. "Sha" can generally be divided into three types. 1: The form of "evil" that can be seen or even touched. Such as: house corners, road rushes, iron towers, telephone poles, chimneys and other poorly shaped objects. Two: The invisible and visible "evil" of Feixing regulating qi. That is, the four unfavorable flying stars in the Ninth House. 1: The two black giant stars are disease symbols. The five elements belong to earth and govern diseases and plagues. 2: Three blue stars are in the sky, the five elements belong to wood, and they are in charge of verbal disputes. 3: Wuhuang Lianzhen star, the five elements belong to earth, and govern misfortunes and disasters. 4: Qi Chi Po Military Star, the five elements belong to gold, it is mainly responsible for disasters such as thieves, official misconduct or surgery. The above four kinds of flying star "evil" energy are usually manifested when the order is lost. Their effects are different, and they all produce a new change after being combined with other flying stars to create a restrained relationship. This change will make its own "evil" energy stronger or weaker. Three: The evil spirit formed by the combination of Li Qi and Luantou. In fact, it is a specific evil produced by the combination of the previous two. Generally speaking, the influence of this evil spirit is quite large. This kind of "evil" energy usually appears in the directions of the door and windows of the house, because these are the only two directions of the entire house that are connected to the outside world, that is, only these two places receive the air and sunlight outside the house. If the hills outside the house or sharp corners of the house, as well as other unfavorable objects and slopes hit the door or window of the house, it will naturally cause evil spirits outside the house. At the same time, when the combination of flying stars in the palaces on the door and window happens to form the "evil" energy in regulating qi, the influence of this "evil" will be greater. Generally speaking, this kind of "evil" is taboo. As the saying goes, "If there is no regulation of Qi in the front, the Qi will not work; if there is no regulation of Qi in the front, there will be no experience."