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The most basic element of the Yi Gua system is the concept of Yin and Yang, including the nature and state of Yin and Yang. If we ignore the state of Yin and Yang and only talk about their nature, we can use Yang Yao (-) and Yin Yao (-) to represent Yin and Yang. The above-mentioned Yin and Yang hexagrams are overlapped three times from bottom to top, forming eight basic hexagrams, namely, "Gan, Kun, Zhen, Xun, Kan, Li, Gen and Hui", which are called Eight Classics hexagrams. You can get six hexagrams by overlapping eight classics and hexagrams. * * * * There are sixty-four hexagrams, which are called other sixty-four hexagrams, and each hexagram has a specific name. If we consider the state of Yin and Yang again, the concept of Yin and Yang can be further divided into four situations, namely "old Yin, Lao Yang, less Yin and less Yang", which can be expressed by four symbols, namely "X, O,-,-,-". Each order of each hexagram may have four states of Yin and Yang, so there are 4096 different hexagrams in all the hexagrams changing systems. If all the hexagrams with the same yin and yang properties are put together, 64 subsystems with the same name of the main hexagrams can be formed, which can be called a hexagram system. The content of the text description in the Book of Changes is the interpretation of the symbolic meaning of some Yi hexagrams in the sixty-four hexagrams system and the corresponding judgment of personnel quality (called occupation). Among them, the first item of each divination system is the corresponding static divination, and the last six items (there are seven items in Gankun divination system) are the sequential divination of the corresponding divination system. After Qin and Han dynasties, there was a wrong or vague understanding of it.

The books divination and Zhouyi originated from the practice of divination in Oracle Bone Inscriptions. Perhaps at the end of the Shang Dynasty, Zhou Wenwang wrote down the hexagrams in the sixty-four hexagrams system. Later in the Spring and Autumn Period, Confucius' disciples inherited Confucius' discovery of Zhouyi and wrote Yi Zhuan. When Qin Shihuang burned books to bury Confucianism, Lisi listed it as a medical divination book and preserved it.