8 1 18 Metaphysics refers to China's traditional philosophical theory based on the number 8. Among them, the number "8 1 18" represents a unique mathematical form called "Yin-Yang Eight Diagrams Mathematics", which is the basic mathematical theory in China's ancient philosophy. It takes the eight diagrams as the basic unit, and further forms the eight diagrams mathematics of sixty-four diagrams through the alternate combination of yin and yang. In China's traditional philosophy, eight diagrams mathematics is a very important part, which has been applied in many fields, such as predicting fate, treating diseases, geomantic omen and so on.

The core theory of metaphysics is the theory of Yin and Yang. It believes that everything in the world is composed of two relative aspects, such as yin and yang, men and women, life and death, sports and so on. These two aspects are interdependent and mutually transformed, which constitute the basic attributes of everything in the universe. 8 18 metaphysics applies the theory of yin and yang to many practical fields, such as traditional Chinese medicine, geomantic omen, garden art and so on. People can improve their physical health, living environment and personal cultivation through the principle of yin-yang theory.

Metaphysics has a profound historical background and cultural connotation in China culture. In recent years, with people's concern and research on traditional culture, 8 1 18 metaphysics has been gradually paid more attention and understood by more people. As an important part of China culture, it provides us with a unique way of looking at the world and the idea of managing the world. In practice, people find that by studying the theory of "8 18 metaphysics", they can better understand their own life rules and physical and mental health, improve their quality of life and benefit the society.