The main basis for looking at the feng shui of Yin Zhai is the "dragon and acupoint {including bright hall, sand, water and direction" among the "Five Geographical Tips". "Dragon" is not a real dragon, it is a mountain or a mountain; "cave" is the tomb; "sand" is the mountain in front of the tomb; "water" is the mouth of the water; "xiang" is the mouth [orientation] of the tomb. In ancient times, the four directions around the tomb in the east, south and northwest were named after four mythical animals. Firstly, it was convenient for memory, and secondly, it was used to highlight the dignity of the deceased ancestors. The names of these four mythical beasts are Qian Zhuque [.South], Hou Xuanwu [North], Left Qinglong [East], and Right White Tiger [West]. The status of the four mythical beasts in the legend is also different. The one sitting on the mountain is the largest at the back, and the second is at the front. There are two guards on the left and right, and the left position has been regarded as auspicious by the past dynasties, while the right position is regarded as unlucky. Therefore, the left green dragon is higher than the right white tiger.