Lei Jing (类经): Zhang Jingyue's Masterpiece of Neijing Classification

What Is Lei Jing?

Lei Jing (类经), meaning “Classified Classic,” is a monumental work of medical scholarship completed in 1624 by Zhang Jingyue (张景岳), also known as Zhang Jiebin. It represents one of the most ambitious attempts to systematically organize and comment upon the Huangdi Neijing — the foundational text of Chinese medicine.

The Huangdi Neijing consists of two parts: the Su Wen (Basic Questions) and the Ling Shu (Spiritual Pivot), totaling 162 chapters. However, the original text is notoriously difficult to work with — related topics are scattered across different chapters, the language is archaic, and the organizational structure does not follow a modern medical logic.

Zhang Jingyue spent over forty years studying the Neijing and solved this problem by completely reorganizing its contents by subject matter rather than preserving the original chapter sequence.

The Author: Zhang Jingyue (1563–1640)

Zhang Jingyue was born in Shanyin (modern Shaoxing, Zhejiang province). He was a physician of the Wenbu (Warm Supplement) school, known for his emphasis on:

• Tonifying Yang and Kidney Fire — he believed that Yang Qi is the root of life
• Using warm, tonifying formulas — particularly those containing cooked Rehmannia (Shu Di Huang)
• Systematic scholarship — rigorous textual analysis combined with clinical experience

He was also a military strategist in his younger years, and his systematic, organized approach to knowledge reflects this background. His major works include:

• Lei Jing (Classified Classic) — 1624
• Lei Jing Tu Yi (Illustrated Appendices to the Classified Classic) — diagrams and charts
• Jing Yue Quan Shu (Complete Works of Jingyue) — his collected clinical writings

Structure of Lei Jing

The genius of Lei Jing lies in its classification system. Zhang Jingyue extracted every passage from both the Su Wen and the Ling Shu and reorganized them into 12 major categories (大类) with 390 subcategories:

Category	Topic	Content
1. Zang Xiang	Organ Manifestations	Zang-Fu organ theory, Qi, Blood, fluids
2. Mai Se	Pulse and Complexion	Pulse diagnosis, facial diagnosis
3. Jing Luo	Meridians and Channels	Channel pathways, acupuncture theory
4. Biao Ben	Root and Branch	Disease priority, treatment strategy
5. Qi Wei	Qi and Flavor	Five flavors, four natures, herbal properties
6. Lun Zhi	Theory and Treatment	Disease causes, treatment principles
7. Ji Bing	Disease Categories	Specific diseases organized by type
8. Zhen Ci	Acupuncture and Moxibustion	Needling techniques, point selection
9. Yun Qi	Five Movements and Six Qi	Climatic medicine, seasonal pathology
10. She Sheng	Health Preservation	Preventive medicine, lifestyle, longevity
11. Hui Ji	Collected Discussions	Philosophy, ethics, medical theory
12. Shi Dao	Dao of the Physician	Medical ethics, the role of the physician

Why This Matters

Before Lei Jing, if a physician wanted to study everything the Neijing says about, for example, the Liver, they would have to read through all 162 chapters and manually collect the relevant passages. Zhang Jingyue did this work for every major topic in medicine.

Each passage is accompanied by Zhang’s detailed commentary, which:

• Clarifies difficult classical language
• Cross-references related passages from different parts of the Neijing
• Draws on his own clinical experience to validate or challenge the text
• Provides clinical application insights

Key Contributions

1. Resolving Contradictions

The Neijing sometimes presents seemingly contradictory statements — for example, different passages suggest different numbers of acupuncture points or different explanations for the same phenomenon. Zhang Jingyue systematically addressed these contradictions and offered resolutions based on clinical logic.

2. Emphasis on Yang

Zhang’s commentary consistently emphasizes the primacy of Yang Qi and Mingmen Fire (Life Gate Fire). He argued that while the Neijing values both Yin and Yang, the text’s deeper message is that Yang is the root of life — a position that influenced later Warm Supplement practitioners.

3. Integration of Theory and Practice

Rather than treating the Neijing as purely theoretical, Zhang consistently connected textual passages to clinical reality. His commentaries frequently note: “In my clinical experience, this passage means…“

4. Diagrammatic Thinking

In the companion volume Lei Jing Tu Yi, Zhang created detailed diagrams illustrating:

• Organ relationships
• Meridian pathways
• Five Element cycles
• Pulse qualities
• Disease progression maps

These diagrams were revolutionary for their time and made complex relationships visually accessible.

Historical Significance

• Most comprehensive Neijing commentary — no other single work matches its scope
• Standard reference for 400 years — still cited in modern TCM education
• Influenced subsequent scholarship — set the standard for how classical texts should be studied
• Bridge between classical and clinical medicine — made the Neijing practical for working physicians

Reading Lei Jing Today

For modern readers interested in exploring Lei Jing:

• Start with a specific topic — use the 12-category structure to find what interests you
• Compare with the original Neijing — read Zhang’s commentary alongside the original passages
• Note the clinical insights — Zhang’s practical experience adds depth to the theoretical text
• Use modern annotated editions — contemporary editions include helpful notes and translations

The work is available in Chinese with various modern annotations. Selected passages have been translated into English in academic contexts, though a complete English translation does not yet exist.

Related Reading

• Huangdi Neijing
• Nan Jing (Classic of Difficulties)
• Jing Yue Quan Shu
• What is Qi?
• Zang-Fu Organs