Jade ruler, "Cihai" interprets it as: "A ruler made of jade. It is a metaphor for the standards for selecting talents and evaluating poetry." Li Bai, a poet of the Tang Dynasty, wrote in the poem "Shangqing Baoding": "The immortal holds a jade ruler to judge how many talents you have. The jade ruler cannot be exhausted, and your talents will never rest." This confirms that the jade ruler is an abstract scale that measures the level of humanities, talents, learning, and talent cultivation in a broad sense. Guo Pu, an outstanding litterateur and exegesis expert in the Eastern Jin Dynasty, who was later revered as the originator of Chinese Feng Shui, said in his "Burial Book": "Tu Gui measures its direction, and jade measures its far and near." Tu Gui, in the Feng Shui compass Before its invention, it was an astronomical instrument used by the ancients to measure the length of the sun's shadow to determine direction, solar terms, time and region. Far and near, that is, far and near. The so-called distance here is of course not just the concept of length and distance, but should include the ups and downs, size, height, and height of all Feng Shui-related factors such as the mountain direction, three-dimensional coordinates, landscape vision, ecological environment, topography, and other factors related to Feng Shui. Evaluation of pros and cons, good and bad, pros and cons. The author of "Jade Ruler Classic" was Yang Yi (also known as Junsong, also known as Jie Poverty) of the Tang Dynasty. Yang Gong named it "Jade Ruler", which is truly exquisite and unique.