Introduction to BaZi and the Four Pillars

IFour pillars: from a birth date to stem–branch symbols

Each birth year, month, day and hour is converted into a pair of symbols, a Heavenly Stem + Earthly Branch. These become the year, month, day and hour pillars. Two characters per pillar make eight in total, giving BaZi its literal name, “Eight Characters of Birth.”

The conversion does not simply follow Gregorian or lunar dates. The year changes at Li Chun, and the month at a solar-term boundary; the hour pillar uses traditional two-hour periods. Accurate alignment of the calendar and solar terms is therefore the first requirement, rather than merely consulting a lunar almanac. A proper chart calculator, rather than a simple zodiac lookup, is needed to determine reliable pillars.

IIOrigins: from Li Xuzhong’s three pillars to Xu Ziping’s Day Master

BaZi developed gradually through the work of successive generations:

• Li Xuzhong in the Tang dynasty: an early approach used the year, month and day pillars, providing a precursor to Four Pillars analysis, but had not yet established the day stem as the central reference.
• Xu Ziping in the Song dynasty: tradition credits Xu with making the day stem represent the person and organizing the whole chart through generation, restraint and transformation. Later generations called this the Zi Ping method, giving the Four Pillars system its mature form.
• Synthesis in the Ming and Qing dynasties: Yuan Hai Zi Ping and San Ming Tong Hui organized patterns and symbolic stars; Di Tian Sui and Zi Ping Zhen Quan developed theories of strength and decline、useful influences and pattern interpretation. These remain core references for BaZi study today.

Accounts of Xu Ziping founding the method are largely retrospective, with limited early documentary support; scholars still discuss the details. This overview presents the received lineage as context for classical-text digitization and cultural study, rather than as settled historical fact.

IIIThe system: stems, branches, Ten Gods and useful influences

A complete BaZi reading combines roughly three conceptual layers.

Stems, branches and the Five Phases — ten stems (Jia, Yi, Bing, Ding, Wu, Ji, Geng, Xin, Ren, Gui) and twelve branches (Zi, Chou, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu, Hai), each associated with a phase—Wood, Fire, Earth, Metal or Water. Generation, restraint, punishment, clash, combination and assembly form the underlying grammar for assessing strength.

The Ten Gods system — taking the day stem as the self, the phase relationships of all other stems and branches are grouped into ten symbols: Direct Officer、Seven Killings (Indirect Officer), Direct Resource、Indirect Resource (Owl), Direct Wealth, Indirect Wealth, Eating God, Hurting Officer, Peer and Rob Wealth. They are relationship coordinates, not direct verdicts of good or bad: Officer suggests rules and responsibility, Eating God expression and enjoyment, and Indirect Wealth flexible resources. Their effect depends on the full configuration and its balance of strength.

Useful, favorable and unfavorable influences — the useful influence identifies the part of a chart most in need of support or adjustment. Four approaches are common: support/restraint for imbalance of strength; climate adjustment for excessive cold, heat, dryness or dampness; mediation between opposing forces; and a specific phase as a remedy for a chart’s central flaw. Influences of the same phase or those that generate the useful influence are termed favorable; those that restrain it or worsen imbalance are unfavorable. This connected method of judgment is a central and demanding feature of BaZi.

IVReading cycles and annual influences

The four pillars form a static natal configuration; ten-year cycles and annual influences bring the time dimension into motion.

Ten-year cycles are derived from the month pillar in a forward or backward sequence, describing the broader setting of successive life stages. Annual stem–branch pairs interact with both the natal chart and the cycle. Together they form the traditional basis for timing: the years in which a type of event is considered more readily activated. This is a method recorded in traditional literature, presented by Jingnang as a cultural experience, without a promise of definite fortune or adversity.

VCommon misconceptions

Several simplified or distorted claims circulate online. These distinctions are useful:

• “Identical BaZi means identical destiny.” — people born in the same year, month, day and hour can share four pillars, but traditional discussions do not equate this with identical lives. “Same chart, different destiny” has long been debated in the classics; environment, choices and family were never excluded.
• “The useful influence is a lucky color or number.” — some naming and accessory tools reduce the concept to a lookup table. Proper analysis requires the full chart’s strength, pattern and climate needs; a color chart cannot replace it.
• “Each Ten God is inherently good or bad.” — these are symbols of relationships, not fixed judgments. Seven Killings may signify pressure or become resolve when controlled by Eating God. Calling any one symbol good or bad without the whole chart is imprecise.

VIHow it differs from Zi Wei and the Seven Luminaries

The three systems use different coordinates. BaZi builds a chart from stems and branches, emphasizing phase strength and patterns. Zi Wei Dou Shu places symbolic stars in twelve palaces, emphasizing palace and star-group relationships. The Seven Luminaries and Four Residuals uses observed celestial positions and degrees within the twenty-eight lunar mansions. In brief: BaZi reads phases, Zi Wei reads palace–star structures, and Seven Luminaries reads actual celestial positions. They offer different perspectives and are often studied together.

VIIExplore BaZi in Jingnang

Jingnang presents these traditional methods digitally. Its BaZi module calculates four pillars from the calendar and solar terms, organizes relationships among the Ten Gods, strength and favorable or unfavorable influences, and generates ten-year and annual sequences. Its own AI reading process draws on classical sources such as Di Tian Sui and Zi Ping Zhen Quan to express complex stem–branch relationships in understandable language. This is offered for traditional cultural study and reflection, not as a promise of outcomes. Use the entry below to calculate your own four pillars.