How is BaZi synastry different from an individual reading?

An individual BaZi reading analyzes one person's chart for personality, fortune trends, and life patterns. Synastry places two charts side by side to compare Five Elements balance, Day Master dynamics, and Useful God alignment. Individual reading shows "what kind of person you are," synastry shows "what happens when you two are together."

What if the synastry result says we are incompatible?

Synastry reveals the interaction patterns between two energy fields — it's not a verdict on whether you should be together. "Incompatibility" usually means tension exists in certain dimensions, but tension isn't necessarily bad — some tensions drive growth. Use synastry results to understand friction points and complementary strengths.

Do I need exact birth times for synastry?

Birth time affects the Hour Pillar and the strength assessment of the Day Master, which impacts analysis precision. If you're unsure of the exact time, you can still run the analysis with just year, month, and day — the result will have one fewer dimension but remains useful. Having exact times for both people produces the most complete reading.

How reliable is AI synastry analysis?

The charting part (Four Pillars arrangement, Five Elements attributes, Branch relationship determination) is algorithmic and fully accurate. The synastry interpretation is generated by AI based on both charts' data — logically transparent but inferential in nature. Useful for understanding relationship dynamics, but shouldn't be the sole basis for major relationship decisions.

←Back to Guide

What Is BaZi Synastry

A beginner's guide to compatibility analysis — from Day Master dynamics to Five Elements balance

Synastry vs. Individual BaZi Reading

An individual BaZi reading examines one person's chart — your personality foundation, fortune trajectory, and life patterns. It only involves one person's Four Pillars.

Synastry places two people's charts side by side. It's not about whether each person is individually "good" or "bad" — it's about what happens when two energy fields interact. Do they complement or conflict? Generate or restrain?

Think of it this way: an individual reading is like reviewing someone's resume. Synastry is like seeing whether two people can actually work well together. A great resume doesn't guarantee chemistry with every partner.

The core question of synastry isn't "who's better?" — it's "what's the chemistry when you're together?"

Four Core Dimensions of Synastry

Day Master Relationship

The Day Master (Day Stem) is the core representation of a person in BaZi. Synastry first examines the Five Elements relationship between both Day Masters: generating (Wood feeds Fire, Fire creates Earth…) or restraining (Metal cuts Wood, Wood parts Earth…)? Generating relationships suggest one party naturally supports the other; restraining relationships indicate tension — though moderate restraint can actually create complementarity.

Five Elements Complementarity

Every person's chart has elements that are strong or weak. Synastry examines whether two people's elemental distributions balance each other — for example, if one person lacks Water and the other has abundant Water, they naturally create equilibrium together. High complementarity often means each person fills gaps the other has.

Earthly Branch Interactions

The Earthly Branches across both people's Four Pillars may form harmony (六合, 三合), clash (六冲), punishment (刑), or harm (害) relationships. Harmony indicates natural rapport and attraction; clash indicates friction and collision. Traditional compatibility analysis pays special attention to the Year Branch (zodiac animal) and Day Branch (marriage palace) relationships.

Useful God Alignment

The Useful God is the Five Element most needed in a person's chart. If one person's Useful God happens to be an element that's abundant in the other person's chart, it means the other person's presence naturally benefits them. Good Useful God alignment often creates the feeling of "being with this person makes me better."

Common Traditional Compatibility Rules

Folk wisdom includes many simple compatibility rules — "Rooster and Dog don't match," "Dragon and Tiger clash," and so on. These sayings have some basis in Branch relationship theory, but they're oversimplified.

In reality, the zodiac animal is just the Year Branch — one of four pillars. Judging compatibility by zodiac alone is like judging by sun sign — it has some reference value but is far from comprehensive.

Complete synastry analysis requires both people's full Four Pillars (year, month, day, hour), examining Day Master dynamics, Five Elements complementarity, Branch interactions, and Useful God alignment across all dimensions. This is why the same zodiac pairing works beautifully for some couples and terribly for others — the other three pillars are completely different.

How to Interpret Synastry Results

Synastry results aren't a simple "compatible" or "incompatible" verdict. A more accurate way to understand them: they reveal where two people naturally resonate and where friction is likely to arise.

"Incompatible" doesn't mean "can't be together." Some tensions are actually growth catalysts — one person's decisiveness compensating for the other's hesitation, one person's sensitivity balancing the other's bluntness. The key is understanding where tensions come from, not being scared by a label.

Similarly, "highly compatible" doesn't guarantee happiness. Synastry examines energy field interaction patterns, not the entirety of a relationship. Real-world relationships are also shaped by communication styles, values, life habits, and countless other factors.

The best use of synastry: understand your relationship's natural strengths and potential friction points, then consciously leverage the strengths and address the friction.

What Information Is Needed

Complete synastry analysis requires both people's birth year, month, day, and hour. With all four pillars, the analysis covers every dimension — Day Master dynamics, Five Elements complementarity, Branch interactions, and Useful God alignment.

If the exact birth hour is unknown, analysis can still proceed with year, month, and day. This means one fewer pillar of information, which affects Day Master strength assessment precision, but the Year, Month, and Day Pillar relationship analysis remains valid.

Worth noting: synastry isn't limited to romantic partners. Business partners, friends, parent-child relationships — any two-person dynamic can be analyzed through synastry to understand interaction patterns.