Introduction
The Gougu （Pythagorean） Theorem——the Pivot of Chinese Civilization The Theory of "Round Heaven and Square Earth" Is Not a Description of the Natural Structure

The Temporal and Spatial Backgrounds of the Book of Changes
Fuxi and the River Map
"Dayan Number" and the Time-Space Pattern of the Book of Changes
Birth of the Early Eight Trigrams
Sequence Diagram of Fuxi's Early Eight Trigrams （One Divided into Two）
The Early Eight Trigrams was derived from the River Map
Taiji Diagram and the Actual Measurement of Primitive Celestial
Phenomena
Diagram of the Order of the Early 64 Hexagrams
Yu the Great and Luo Writing
The Relationship Between the Luo Writing and the River Map, the Correlation of the Five Elements
Duke Wen Wrote the Zhou Yi
Relationship Between the Later Eight Trigrams and the Early Eight
Trigrams
Order of the Later Eight Trigrams
Illustration of the Images of the Eight Trigrams
The Book of Changes Is a Yin-Yang Combination System
The Principle of the Ancient Divination Method

Full Explanations of the Zhou Yi's 64 Hexagrams
Health Preservation on the Principle of Heaven and Man As One
Epilogue

Preface
The Book of Changes holds that all functions of the Universe come from Nature. Hence, as an element of Nature, mankind should, without exception, also mold its acts and thoughts to the spirit of Nature.
As far as methodology is concerned, the Book of Changes is a logical system using Gougu （Pythagorean） Theorem as the pivot, and using time and space to unify all things in the Universe in terms of their function （instead of their physical structure）.
In the Book of Changes the ancient Chinese used the River Map and Luo Writing to record the natural pedigree of function, constituting a general grasp of time and space of the Universe, and forming the "simplest form of macro and micro power models" as described in the language of mathematics. It has formed its own system of logic, and built up a system of explanation and deduction for the whole of traditional Chinese culture.
The great charm of the Book of Changes lies in the fact that, by using the "axiomatized" method, that is, starting from the earliest primitive concepts and a few self-evident axioms and postulates, and using deductive reasoning, it has worked out all the inherent theorems of mankind under the guidance of the world outlook of "Heaven and Man As One, " and crafted them into a self -contained system of logic.