First, briefly explain the name of the Book of Changes: Yi's explanation: there are basically four kinds, 1, the day before and the next month, 2, if lizards change, they are easy; 3. It's easy to simplify; 4, the sun, the sun, life. Jing also has three definitions: 1, the word "Tao" and the path; 2, classic; 3. method. Taken together, the role of the Book of Changes is to guide people to observe various phenomena in nature, understand the scientific mystery of the dialectical unity of yin and yang, fully grasp the opportunities of weather, geography and human harmony, and realize the greatest value of life in a better environment. I ching involves science, mathematics, logic, philosophy, practice, divination and so on. Therefore, it has become a classic of Taoism, Confucianism and Yinshu, and the three major religions have different understandings and applications of it in their respective fields. Second, the emergence, development and changes of the Book of Changes: In historical legends, there are sayings that Fuxi painted gossip, Zhou Wenwang wrote the Book of Changes (so the Book of Changes is also called the Book of Changes) and Confucius revised the Book of Changes. In myths and legends, there is also a saying that Yi Shan was the founder of the Book of Changes and Xuan Nv passed it on in nine days. Because of its long history, Taoism, Confucianism and Shu have different understandings of Yi, and so far they have different views on its emergence and development. Judging from the good inheritance of Taoism and Shushu School, it basically has the meaning of providence. Generally speaking, the Book of Changes was created and constantly revised by many ancient sages (or gods) according to the development and change laws of nature (or heaven and life) for a long time. Among them, the ancient sages (or Lianshan clan, Xuan Nv for nine days) summed up in a certain period and became "Lianshan Guyi". After the death of the sage Pangu, he wrote Return to the Elephant. After a long time, the sage observed the changes of nature (the development of heaven and society), reconstructed the Book of Changes, made the Book of Changes, and spread it to Fuxi. Going back to Tibet tends to pay attention to personal practice and human development. When I arrived in Zhou Wenwang, the natural and social environment changed again. King Wen developed the Book of Changes and named it Zhouyi (Zhouyi is the Zhou Dynasty, with a circle and a turnover). When Confucius arrived, his supplement and revision tended to focus on righteousness (philosophy). 1994 Bamboo slips of Chu Tomb in Warring States Period were unearthed in Tianxingguan, Hubei Province, and the legendary "Returning to Tibet" was unearthed, but it has not been sorted out, and "Lianshan" will not be circulated. [Edit this paragraph] The Book of Changes is a book used for divination in ancient China, commonly known as the Book of Changes. There are already records of Zhouyi in Zuozhuan, such as Zuozhuan Xianggong Nine Years:' Jiang Yue:' Died of Zhouyi:' Sui, Yuan Henglizhen ...'' Zuozhuan Zhao Zhuan Gong Seven Years':' Confucius praised Zhouyi. "Explain that Zhouyi appeared at the latest in the Spring and Autumn Period and the Warring States Period. At present, there is still controversy about the time when Zhouyi was written, but the view that Zhouyi was written in the early Western Zhou Dynasty is accepted by most people. There are always different opinions about the word "Zhou" in Zhouyi. For example, some people think that Zhou means "everything is ready in Zhou Pu"; Some people think that Zhouyi refers to the Zhou Dynasty. The Zhou Dynasty was accepted by ordinary people, and many people thought that the word "Zhou" in Zhouyi was the name of the dynasty. The interpretation of the word "Yi" in Zhouyi is complicated. One said: "Yi is a word, from day to month, there are yin and yang." "Easy, the sun and the moon are also." "The moon is easy and quite soft. One said, "Yi is like a bird." One said, "Yi is a lizard. Lizards change color because of the environment, and it is easy to change every day. "In the Qing Dynasty, Chen Ze wrote" Introduction to Zhouyi ",which divided the definition of" Yi "into two parts: saying: trading, yin and yang are cold and hot, and the upper and lower governance is also; Yue: change, spring, summer, autumn and winter, cycle also. No matter what kind of explanation, it is not wrong to say that Zhouyi is about the interaction of yin and yang, which produces everything, "combining rigidity with softness, changing in it". During the Western Han Dynasty, Confucianism regarded Zhouyi, Shi, Shu, Li, Yue and Chunqiu as classics, which were collectively called the Six Classics. So the Book of Changes is also called the Book of Changes. The Book of Changes, the root of China culture, was born in the Neolithic Age and is an important symbol of China's entry into civilized society. It is not only the earliest civilized classics, but also has an important influence on Taoism, Confucianism, Chinese medicine, writing, mathematics, philosophy and folk culture in China. The Book of Changes is a manual coding system. It consists of eight diagrams, sixty-four hexagrams and three hundred and eighty-four hexagrams, and is coded by yin and yang. It is described in words with hexagrams. It has a strict and perfect mathematical structure of internal code. It is the symbol system with the strongest rank and the most rigorous structure in ancient civilization, and it is also the earliest example of using system theory. The openness and compatibility of Yijing set an example for the application of system theory in later generations. The coding of Yijing follows the strict laws of similarity, correspondence, correlation and relativity, and simulates the development and evolution of all things in the universe with simple hexagrams to find the relationship between things. Compared with the modern science of concrete connection, it is a brand-new field, and its mystery is still worthy of further study. The Yin-Yang theory encoded in the Book of Changes, its extreme change law and the thought of "Eight Diagrams in Days" have a far-reaching influence on Taoism, which is the ideological basis of Taoism and regarded as "one of San Xuan" by Taoism. The Book of Changes is also an important source of Confucian thoughts such as the golden mean, benevolence and righteousness, courtesy, wisdom and faith, the three cardinal guides and the five permanents, and is regarded as the "head of the group classics" by Confucianism. Yin-yang theory in Yijing is the basis of Yin-yang theory in traditional Chinese medicine. The idea of real-time positioning and keeping pace with the times in Yijing has a vital influence on Chinese medicine, and the treatment principle of "one person, one side, treating diseases" all comes from this. At the same time, it has an important influence on the formation of six evils, such as meridian flow, eight principles of syndrome differentiation, wind, cold, summer heat, dampness and fire. Huangdi Neijing, a classic work of traditional Chinese medicine, is greatly influenced by Yijing. Shennong's Classic of Materia Medica in the Eastern Han Dynasty used the concept of gossip to take pictures, and made clear the principle of using traditional Chinese medicine. Zhang Zhongjing's Treatise on Febrile Diseases developed the theory of Yin and Yang and Taiji into the theory of six meridians, established the principle of syndrome differentiation of six meridians and laid the foundation for clinical medicine. The Book of Changes has a direct influence on military theory. Wang Yinglin in Song Dynasty said in Zi Zhi Tong Jian: "Gai Yi is a book, and the Art of War is well prepared. "Sixty-four hexagrams of the Book of Changes are suitable for the choice of war maneuver strategy. Famous military strategists in history, such as Sun Bin, Wuqi, Zhuge Liang, were all deployed according to the principles of the Book of Changes. The History of Qi Jiguang's Anti-Japanese War also referred to the principles of the Book of Changes when establishing the array law. The Book of Changes also greatly inspired the development of Wushu. In the Book of Changes, there is a saying that "a gentleman uses a weapon to prevent danger", which has a direct impact on the formation of martial arts fitness and self-defense concept. Baguazhang, Taiji Zhuan, etc. All come from the theory of the Book of Changes.