Mr. Feng Shui applies the "Four Elephants" to the terrain, and uses the images and actions of the "Four Elephants" to compare the terrain, which is accompanied by good and bad luck. "Biography of the Three Kingdoms and Guan Ju" records: "Ge went west with the army, passed the tomb of Wu, leaned against the tree and mourned, and was unhappy. It is said that although trees are lush, they can bloom for a long time. Although the tablet looks good, there is nothing to keep. Xuanwu hides its head, the black dragon has no feet, the white tiger hugs its body, and the rosefinch cries sadly. It is necessary to prepare for the four dangers, so the law will be extinct. But after two years, it should be gone. " This is based on the fact that the four elephants are in a state of four dangers, and it is judged that Wu will be extinct within two years. Guo Pu also preached this point in "Buried Classics", saying: "Classics, Classics and Classics have four potentials, and qi comes from all directions. So on the left is the dragon, the white tiger, Suzaku in front and Xuanwu in the back. Xuanwu hangs its head, Suzaku dances, Qinglong winds and white tigers tame. If the situation is reversed, it should be against the law. Therefore, the tiger crouched and said the corpse, the dragon crouched and said the Lord was jealous, Xuanwu refused to hang the corpse, Suzaku did not dance, the soil returned to its position, and the jade measured its distance. Those who regard branches as dragons and tigers will stop at hills, such as elbows and arms, which is called embracing. Those who use water as a rosefinch will be in a state of decline and prosperity, and they will be afraid of turmoil, which is called weeping. "