Tai Chi Glossary > I Ching (易经)

I Ching (易经)

Definition: The I Ching (易经) is the ancient Chinese Book of Changes—a cosmological and philosophical text whose eight trigrams and sixty-four hexagrams form the theoretical foundation of tai chi’s technical framework and Taoist worldview.

The I Ching is one of the oldest texts in human history still in continuous use. Scholars date its core material to the Western Zhou dynasty—roughly 1000 BCE—with layers of commentary added by Confucius and his school over subsequent centuries. It has been consulted as an oracle, studied as a philosophy, used as a basis for military strategy, and applied as a framework for medicine, cosmology, and martial arts.

For tai chi practitioners, it matters primarily for the last of these: the I Ching’s structure of eight trigrams and their combinations provides the cosmological scaffolding on which tai chi’s technical vocabulary is built.

In Brief

• 易经 (yì jīng) : 易 means change, transformation, or exchange; 经 means classic, canon, or foundational text—together: “Classic of Changes”
• The I Ching describes reality as a continuous process of transformation between complementary states, governed by the interplay of yin (broken line ⚋) and yang (solid line ⚊)
• Its eight trigrams ( 八卦 , bā guà) map directly onto the Ba Fa (eight methods) of tai chi—each method corresponding to a trigram and its quality of force
• The sixty-four hexagrams describe every possible combination of the eight trigrams—a complete model of how situations arise, develop, and transform Understanding the I Ching deepens tai chi practice by making explicit the pattern of transformation that every push hands exchange embodies

The Structure of the I Ching

The I Ching’s foundation is binary: everything can be described in terms of yin and yang. A yin line is broken (⚋); a yang line is solid (⚊). Stack three lines and you get a trigram—one of eight possible combinations. Stack two trigrams and you get a hexagram—one of sixty-four possible combinations. This is the complete architecture of the text.

The eight trigrams (八卦, bā guà) are :

Trigram	Name	Image	Quality
☰	Qian (乾)	Heaven	Creative, strong, expanding
☷	Kun (坤)	Earth	Receptive, yielding, containing
☵	Kan (坎)	Water	Flowing, dangerous, penetrating
☲	Li (离)	Fire	Illuminating, clinging, transforming
☳	Zhen (震)	Thunder	Arousing, initiating, shocking
☴	Xun (巽)	Wind	Penetrating, gentle, persistent
☶	Gen (艮)	Mountain	Stillness, stopping, consolidating
☱	Dui (兑)	Lake	Joyous, opening, exchanging

These are not merely symbols. Each trigram describes a specific quality of energy and movement—a way that force organizes itself and transforms. This is why they map so naturally onto tai chi’s eight methods: each method is not just a technique but a quality of force with its own internal logic, and the trigrams describe exactly that quality.

The Eight Trigrams and Ba Fa

The mapping between the I Ching’s eight trigrams and tai chi’s Ba Fa is one of the most intellectually satisfying aspects of classical tai chi theory. It is not a superficial association—the qualities of each trigram correspond precisely to the qualities of its associated method.

• Qian (Heaven, ☰) maps to Peng (掤, Ward Off) : creative, expanding, strong, filling space. Peng is the omnipresent buoyant expanding quality that must pervade every tai chi movement—exactly the quality of heaven filling space.
• Kun (Earth, ☷) maps to Lu (捋, Roll Back) : receptive, yielding, containing. Lu follows the opponent’s force without opposing it, receiving and redirecting—exactly earth’s quality of yielding to contain.
• Kan (Water, ☵) maps to Ji (擠, Press) : flowing, finding the path of least resistance, penetrating gaps. Ji fills the space that Lu has opened—water flowing into every available channel.
• Li (Fire, ☲) maps to An (按, Push) : illuminating, transforming, releasing. An’s downward-and-forward sealing press releases through the opponent’s center—fire transforming what it touches.
• Xun (Wind, ☴) maps to Cai (採, Pluck) : gentle yet penetrating, persistent. Wind finds every gap; Cai finds the moment of vulnerability in the opponent’s structure and acts on it.
• Zhen (Thunder, ☳) maps to Lie (挒, Split) : sudden, arousing, initiating movement. Thunder arrives without warning; Lie disrupts the opponent’s structure with sudden divergent force.
• Gen (Mountain, ☶) maps to Zhou (肘, Elbow) : stillness, consolidation, stopping. The mountain does not move; the elbow at close range is a point of structural solidity.
• Dui (Lake, ☱) maps to Kao (靠, Body Strike) : open, exchanging, joyous contact. The lake’s surface meets everything that touches it; Kao uses the full body surface as a contact and issuing point.

Change as the Central Principle

The character 易 (yì) means change, transformation, or exchange—and this is the I Ching’s most fundamental teaching: reality is not a collection of fixed things but a continuous process of transformation. Nothing is permanently yin; nothing is permanently yang. Every state contains the seed of its opposite and is already transforming toward it.

For tai chi practitioners, this is not abstract philosophy. It is a description of what push hands actually feels like when it is working correctly. The opponent is attacking (yang)—but within that attack is the moment of maximum commitment, which is already the seed of vulnerability (yin). The practitioner yields (yin)—but within that yielding is the stored potential for counter (yang). Substantial and insubstantial are always exchanging. Central equilibrium is maintained not by fixing the center but by continuously transforming in response to changing conditions.

The sixty-four hexagrams describe this process in its full complexity—every possible configuration of two trigrams, and therefore every possible combination of two qualities of force. Practitioners who study the hexagrams alongside push hands training find that the text describes tactical situations with surprising precision. This is not because the I Ching was written as a martial arts manual, but because both the text and the practice are explorations of the same underlying pattern: how situations arise from the interaction of complementary forces, develop through transformation, and resolve into new configurations.

The I Ching and Five Elements

The Five Elements (五行) framework that governs much of Chinese medicine, qigong, and jingluo theory is closely related to but distinct from the I Ching’s eight trigrams. Both are systems for describing transformation; they approach it from different angles. The I Ching’s trigrams describe the qualitative character of forces and their combinations—how heaven and earth, water and fire, mountain and lake interact. The Five Elements describe the cyclical sequence of transformation—how Wood generates Fire, Fire produces Earth, and so on through the generating and controlling cycles.

In classical tai chi theory, both frameworks operate simultaneously. The eight trigrams structure the technical vocabulary through Ba Fa; the Five Elements structure the footwork through Five Steps. Together they constitute the Thirteen Postures (十三势)—the complete framework of tai chi chuan. Understanding either framework in isolation gives partial insight; understanding both together, and how they interrelate, approaches the classical theoretical architecture.

Studying the I Ching as a Tai Chi Practitioner

The I Ching rewards study at multiple levels—as an oracle, as a philosophical text, and as a structural framework for understanding change. For tai chi practitioners, the most directly useful approach is probably the last.

Reading the descriptions of the eight trigrams alongside practice—sitting with Qian’s “creative strength filling space” while developing Peng, feeling Kun’s “yielding receptivity containing without resistance” while training Lu—builds a conceptual and experiential vocabulary that makes the connections between philosophy and practice concrete. The I Ching does not replace push hands or form practice. It provides a language for what those practices are producing.

Several English translations are available. The Wilhelm/Baynes translation remains the most comprehensive in English and includes the Ten Wings—the classical commentaries attributed to Confucius that extend the text’s philosophical dimension significantly. For practitioners interested primarily in the structural aspects relevant to tai chi, the trigram descriptions and their movement qualities are the most immediately useful entry points.

• Ba Fa — the eight methods directly mapped onto the I Ching’s eight trigrams
• Eight Gates — the spatial framework of Ba Fa, organized by the I Ching’s eight directions
• Five Elements — the complementary transformation framework governing the Five Steps
• Taiji — the Supreme Ultimate that arises from Wuji and generates yin and yang in the I Ching’s cosmology
• Yin and Yang — the binary polarity whose combinations the I Ching describes
• Wuji — the undifferentiated state before trigram differentiation begins
• Central Equilibrium — the still center maintained through continuous I Ching-style transformation
• Emphasis, Substantial and Insubstantial — the yin-yang exchange that the I Ching’s core principle describes
• Push Hands — the practice whose tactical exchanges embody I Ching transformation patterns
• Classics — the tai chi foundational texts that draw extensively on I Ching theory

Have questions about the I Ching and its relationship to tai chi theory? Our forum thread — Qigong FAQ: Everything Beginners Ask — Answered by Senior Practitioners — covers this and many more topics answered by experienced practitioners.