‹See RfD›
The Four Pillars of Destiny (Chinese: 四柱命理; pinyin: sìzhù mìnglǐ), also known as BaZi (Chinese: 八字; pinyin: bāzì; lit. 'eight characters'), is a Chinese astrological and calendrical system used to analyse an individual's destiny or life path based on the person's date and time of birth. The system derives its name from its core structure: four "pillars", each consisting of a pair of characters — one Heavenly Stem and one Earthly Branch — corresponding to the year, month, day, and hour of birth. Since each pillar contains two characters, the four pillars together yield eight characters, hence the alternative name BaZi ("eight characters").
The Four Pillars system is one of the principal methods within the broader tradition of Chinese destiny calculation (命理學, mìnglǐxué) and is closely related to other Chinese metaphysical systems including feng shui, Qimen Dunjia, Zi Wei Dou Shu, and Chinese astrology. The system remains widely practised in mainland China, Taiwan, Hong Kong, Singapore, Malaysia, and among Chinese diaspora communities. Regional variants are practised in Korea (where it is known as Saju, 사주) and Japan (where it is known as Shichū Suimei, 四柱推命).
The conceptual foundations of the Four Pillars system lie in the correlative cosmology that developed during the Han dynasty (206 BCE – 220 CE), which systematically mapped correspondences between celestial phenomena, temporal cycles, and human affairs using the Heavenly Stems and Earthly Branches, yinyang theory, and the Five Phases (五行, wǔxíng). The use of stem-branch pairs to record dates — a practice central to the Four Pillars method — dates to at least the Shang dynasty (c. 1600–1046 BCE), as evidenced by oracle bone inscriptions that record the sexagenary (sixty-day) cycle.
The formal systematisation of the Four Pillars as a method of destiny calculation is traditionally attributed to the Tang dynasty (618–907) scholar Li Xuzhong (李虛中, c. 761–813), who is credited with developing a method of analysing a person's fate based on the stem-branch pairs of the year, month, and day of birth — that is, three pillars and six characters. The expansion to four pillars and eight characters, incorporating the hour of birth, is attributed to the Song dynasty (960–1279) scholar Xu Ziping (徐子平), whose work became so influential that the Four Pillars method is sometimes called the Ziping method (子平法, Zǐpíng fǎ) in his honour.
The Song dynasty represented a formative period for Four Pillars practice. The classic text Yuanhai Ziping (淵海子平, The Deep Sea of Ziping), compiled during the Song and later revised during the Ming dynasty, became one of the foundational manuals for practitioners and remains in use today. Subsequent important texts include the Sanming Tonghui (三命通會, Comprehensive Guide to the Three Fates), attributed to the Ming scholar Wan Minying (萬民英), and the Diqian Suiji (滴天髓, Dripping Sky Marrow), a text of disputed authorship that is regarded as one of the most sophisticated treatises on Four Pillars theory.
During the Ming and Qing dynasties, Four Pillars calculation was among the methods used by officials of the Qintianjian (欽天監, Imperial Astronomical Bureau) for court divination, including the selection of auspicious dates for state ceremonies and the assessment of compatibility for imperial marriages. While Four Pillars practice was not exclusively an imperial method — it was widely used by professional fortune-tellers (命理師, mìnglǐshī) throughout Chinese society — the court's use of it lent the system prestige and institutional support.
During the 20th century, Four Pillars practice, along with other forms of traditional Chinese divination, was discouraged under modernisation campaigns in mainland China, particularly during the New Culture Movement and later under the People's Republic of China, which classified such practices as superstition (迷信, míxìn). The practice nonetheless survived and experienced a significant revival from the late 20th century onward, particularly in Taiwan, Hong Kong, Singapore, and Malaysia. In mainland China, a gradual relaxation of restrictions since the 1980s has allowed Four Pillars consultation to resume openly, often marketed alongside feng shui services.
