Orientation, southeast and northwest, combined with five elements, belongs to oriental wood, southern fire, western gold, northern water and intermediate soil. According to the eight diagrams, the other four directions are derived from five main directions, such as northwest (Jinshui), southwest (Hawking), northeast (Shui Mu) and southeast (Muhuo). It is called auxiliary orientation. The earth where people live has an orientation, which is the most important thing. The orientation of the house where people live is the second most important. The main orientation is not easy to change, while the auxiliary orientation (such as company and home) can be avoided by human beings.