Bazi Compatibility
HÉ HŪN 合婚 · THE ART OF DESTINY MATCHING
KEY TAKEAWAYS / TL;DR
- ◈Bazi compatibility (合婚 Héhūn) is a multi-layered system for assessing relationship harmony, historically performed during the "Wenming" (问名) stage of the traditional Chinese Six Etiquettes of Marriage.
- ◈The analysis operates on four levels: Earthly Branch relationships (六合/三合/六冲/六害), Na Yin life order matching, Day Master compatibility (天干合), and Yong Shen complementarity.
- ◈Modern practitioners emphasize that no single factor determines compatibility — a comprehensive reading considers all four pillars of both charts and their cross-interactions.
Bazi compatibility (合婚 Héhūn, literally "matching marriages") is a traditional Chinese practice of assessing romantic and marital compatibility through the comparison of two individuals' Four Pillars birth charts. The practice is deeply embedded in Chinese marriage customs, historically forming a critical step in the Six Etiquettes (六礼 Liùlǐ) — the traditional wedding protocol documented since the Zhou Dynasty (c. 1046–256 BCE).
During the "Wenming" (问名) stage, the bride's family would provide her Bazi to the groom's family for divination. A fortune-teller would compare the two charts using a hierarchy of methods — from the accessible Na Yin year-element check to the sophisticated Day Master and Yong Shen analysis. The practice continues today across China, Taiwan, Japan (within Shichū Suimei), and Korea (within Saju/Gunghap).
Earthly Branch Compatibility (地支合婚)
THE FOUNDATION — ZODIAC ANIMAL MATCHING
The most well-known and oldest layer of Bazi compatibility analysis. Based on the relationships between the Twelve Earthly Branches of each person's birth year, month, day, and hour pillars.
Six Harmonies (六合 Liùhé)
One-to-one bonds between specific branch pairs. These pairings represent deep, complementary attraction and are considered the strongest compatibility signal. The six pairs are: Rat–Ox (子丑合 → Earth), Tiger–Pig (寅亥合 → Wood), Rabbit–Dog (卯戌合 → Fire), Dragon–Rooster (辰酉合 → Metal), Snake–Monkey (巳申合 → Water), Horse–Goat (午未合 → Fire/Earth). When the Day Branch (marriage palace) of one person forms a Six Harmony with the other's, traditional practitioners consider this an ideal match.
Three Harmonies (三合 Sānhé)
Triangular alliances of three branches sharing an elemental affinity. These represent cooperative, reinforcing bonds. The four trios are: Shen–Zi–Chen (申子辰 → Water), Hai–Mao–Wei (亥卯未 → Wood), Yin–Wu–Xu (寅午戌 → Fire), Si–You–Chou (巳酉丑 → Metal). In compatibility, having Three Harmony connections across multiple pillars indicates a stable, long-term partnership built on shared values.
Six Clashes (六冲 Liùchōng)
Direct confrontations between opposing branches. These represent inherent tension and friction. The six pairs are: Rat–Horse (子午冲), Ox–Goat (丑未冲), Tiger–Monkey (寅申冲), Rabbit–Rooster (卯酉冲), Dragon–Dog (辰戌冲), Snake–Pig (巳亥冲). A clash between Day Branches is traditionally considered a warning sign, though modern practitioners emphasize that clashes can also represent dynamic attraction if other elements compensate.
Six Harms (六害 Liùhài)
Covert, undermining relationships that erode trust over time. The six pairs are: Rat–Goat (子未害), Ox–Horse (丑午害), Tiger–Snake (寅巳害), Rabbit–Dragon (卯辰害), Monkey–Pig (申亥害), Rooster–Dog (酉戌害). Harm relationships are subtler than clashes — they often manifest as misunderstandings, resentment, and gradual emotional drift rather than open conflict.
Na Yin Five Elements (纳音合婚)
THE CLASSICAL METHOD — LIFE ORDER MATCHING
Na Yin (纳音 Nàyīn) assigns each of the 60 Sexagenary Cycle pillars to one of 30 poetic "life order" categories, grouped under the Five Elements. This method was historically the first check performed during the "Wenming" (问名) stage of the traditional Chinese Six Etiquettes of Marriage.
How Na Yin Works
Each birth year maps to a Na Yin element with a poetic descriptor. For example: 甲子/乙丑 = "Ocean Gold" (海中金), 丙寅/丁卯 = "Furnace Fire" (炉中火), 甲辰/乙巳 = "Lamp Fire" (覆燈火). Compatibility is assessed by examining the productive/destructive cycle between the two people's Na Yin elements. Productive relationships (Metal → Water → Wood → Fire → Earth → Metal) are favorable; destructive relationships (Metal → Wood → Earth → Water → Fire → Metal) require further analysis.
Strengths & Limitations
Na Yin provides a quick, accessible compatibility check using only birth years — making it popular for initial screening. However, modern Bazi practitioners consider it insufficient on its own because it ignores the month, day, and hour pillars entirely, missing 75% of the chart's information. The method remains culturally significant and is still widely used in folk practice across China, Taiwan, Japan (as part of Shichū Suimei), and Korea (as part of Saju).
Day Master Compatibility (日主合婚)
THE CORE — PERSONALITY & ENERGY MATCHING
Considered the most sophisticated level of Bazi compatibility analysis. This method compares the Day Masters (日主 — the Heavenly Stem of each person's Day Pillar) and examines how they interact through the productive and destructive Five Element cycles.
Heavenly Stem Combination (天干合 Tiāngān Hé)
Five specific stem pairings can "combine" (合) to transform into a new element: Jia–Ji (甲己合 → Earth), Yi–Geng (乙庚合 → Metal), Bing–Xin (丙辛合 → Water), Ding–Ren (丁壬合 → Wood), Wu–Gui (戊癸合 → Fire). When two people's Day Masters form a Heavenly Stem Combination, traditional Bazi considers this the strongest possible compatibility signal — a natural magnetic attraction at the core identity level.
Five Element Interaction
Beyond direct combination, Day Master compatibility examines the broader Five Element relationship: Does one person's Day Master produce the other's (生)? Or does one control/restrain the other (克)? Productive relationships suggest natural support and nurturing. Controlling relationships can indicate power dynamics — not inherently negative, but requiring awareness and balance. Same-element Day Masters (比) indicate deep understanding but potential competition.
Useful God Complementarity (用神互补)
THE ADVANCED — ELEMENTAL BALANCE ANALYSIS
The most nuanced layer of compatibility analysis. This method examines whether one person's chart naturally provides the element that the other person most needs (their Yong Shen / Useful God) for balance.
Principle of Complementary Balance
In Bazi theory, every chart has elemental imbalances — some elements are in excess, others are deficient. The Yong Shen (用神) is the element most needed to restore balance. When one partner's chart naturally produces or contains the other's Yong Shen, the relationship provides a sense of "completion" — each person unconsciously supplies what the other lacks. This is considered the deepest and most sustainable form of compatibility.
Practical Application
For example, if Person A's Day Master is strong Yang Fire with excess fire energy, their Yong Shen might be Water (to cool and balance). If Person B has strong Water in their chart, their presence naturally balances Person A's energy. The ideal scenario is mutual complementarity — where each partner's chart provides the other's Yong Shen. This bidirectional balance is rare but represents the highest form of Bazi compatibility.
Important: Bazi compatibility is a cultural and philosophical tradition. Modern practitioners emphasize that it should be used as one lens for self-understanding, never as the sole basis for major life decisions.
Source: Wikipedia — Chinese zodiac, §Compatibility; Traditional Chinese marriage, §Six Etiquettes; Wuxing, §Ming nayin; Four Pillars of Destiny, §Structure