BaZi Compatibility
The five classical combinations
甲己合（Jia–Ji）
Jia and Ji combine: loyalty, home-building, and quiet mutual dependence.
乙庚合（Yi–Geng）
Yi and Geng combine: gentleness that shapes strength, and strength that gives gentleness form.
丙辛合（Bing–Xin）
Bing and Xin combine: radiance and refinement, each making the other worth looking at.
丁壬合（Ding–Ren）
Ding and Ren combine: intensity, intimacy, and the need for structure around the flame.
戊癸合（Wu–Gui）
Wu and Gui combine: reliability for daydreams, subtlety for walls — a practical, patient union.
Every Day Master, every relation at a glance
| Day Master | Combines with | Nourished by (Resource) | Expresses through (Output) | Tested by (Officer) | Steward of (Wealth) |
|---|---|---|---|---|---|
| 甲 Jia | 己 | 壬 癸 | 丙 丁 | 庚 辛 | 戊 己 |
| 乙 Yi | 庚 | 壬 癸 | 丙 丁 | 庚 辛 | 戊 己 |
| 丙 Bing | 辛 | 甲 乙 | 戊 己 | 壬 癸 | 庚 辛 |
| 丁 Ding | 壬 | 甲 乙 | 戊 己 | 壬 癸 | 庚 辛 |
| 戊 Wu | 癸 | 丙 丁 | 庚 辛 | 甲 乙 | 壬 癸 |
| 己 Ji | 甲 | 丙 丁 | 庚 辛 | 甲 乙 | 壬 癸 |
| 庚 Geng | 乙 | 戊 己 | 壬 癸 | 丙 丁 | 甲 乙 |
| 辛 Xin | 丙 | 戊 己 | 壬 癸 | 丙 丁 | 甲 乙 |
| 壬 Ren | 丁 | 庚 辛 | 甲 乙 | 戊 己 | 丙 丁 |
| 癸 Gui | 戊 | 庚 辛 | 甲 乙 | 戊 己 | 丙 丁 |
How to read the table
The Combine column is the 干合 partner — the stem with the classical bond, each one a combination page above. The other four columns are the standard relations every Day Master has to the world: Resource nourishes you (the people and studies that feed you), Output is what you express, Officer is what tests and structures you, and Wealth is what you steward. In a relationship, partners whose stems land in different columns for each other experience structurally different bonds — and the classics read the whole map, not one cell.
Meet the ten Day Masters themselves →
Find your Day Master and your combination partner — free BaZi chart
Questions people ask
How does BaZi actually read compatibility?
By comparing two charts — beginning with the two Day Masters and their relation (combination, generation, mutual test), then weighing the other pillars, the elements each chart needs, and both luck cycles. A day-master pairing is the headline; the full charts are the article.
Is 相性 the same as sun-sign compatibility?
No. Sun signs compare one solar month; BaZi compares sixteen characters computed from both birth moments plus their interactions. That is why classical readers are cautious about single-rule matchmaking — there is simply more chart to read than one pairing.
What are the five combinations (干合)?
The five classical stem bonds: 甲己合, 乙庚合, 丙辛合, 丁壬合, 戊癸合 — each pairing one yang stem with one yin stem of a controlling pair. The classics read them as marriage-type unions, and the five pages above explain why, one pairing at a time.