The 12 Earthly Branches: Foundation of Your BaZi Chart

If the Heavenly Stems are the weather in your chart, the Earthly Branches are the terrain. Stems sit in plain sight, but Branches operate below the surface -- each one concealing one to three hidden stems inside, while forming harmonies, clashes, and other interactions with their neighbors.

In many ways, understanding the Branches is where BaZi analysis truly begins.

The Twelve Branches at a Glance

BaZi uses twelve Earthly Branches. Each one maps to an element, a zodiac animal, and a specific month and season:

Notice that the four Earth Branches (Chou, Chen, Wei, Xu) appear at the seasonal transitions. They serve as pivots between seasons -- and they are among the most nuanced elements to analyze in any chart.

Hidden Stems: What Lives Inside Each Branch

Here is what makes Branches truly fascinating: each one contains one to three hidden Heavenly Stems, called "hidden stems" (藏干).

Think of a Stem as a person standing in the open, while a Branch is a building. You have to step inside to see who actually lives there.

  • The Main Qi is the dominant force and defines the Branch's primary nature
  • Middle Qi and Residual Qi are secondary, but they can play a decisive role under the right conditions

Why does this matter? Many of BaZi's deeper judgments -- identifying the useful god, mapping the Ten Gods -- depend on hidden stems. What you see on the surface is just the tip of the iceberg; the hidden stems are the mass beneath the waterline.

Branch Relationships: Harmonies, Clashes, and More

Branches don't exist in isolation. They interact in ways that significantly shift the balance of elemental forces in a chart. Here are the most important relationships:

Six Harmonies -- One-to-One Bonds

A Six Harmony is a deep pairing between two Branches. But don't be misled by the word "harmony" -- at its core, each Six Harmony is a generating or restraining relationship with reduced intensity. The two branches lock onto each other, and one side is either strengthened or weakened as a result.

  • Zi + Chou (子丑) → Earth restrains Water. Zi Water is weakened by Chou Earth's control.
  • Yin + Hai (寅亥) → Water generates Wood. Yin Wood is strengthened by Hai Water's support.
  • Mao + Xu (卯戌) → Wood restrains Earth. Xu Earth is weakened by Mao Wood's control.
  • Chen + You (辰酉) → Earth generates Metal. You Metal is strengthened by Chen Earth's support.
  • Si + Shen (巳申) → Fire restrains Metal. Shen Metal is weakened by Si Fire's control.
  • Wu + Wei (午未) → Fire generates Earth. Wei Earth is strengthened by Wu Fire's support.

The key point: a Six Harmony is not a "merger into something new." It is more like two people locked in a partnership where one supports or constrains the other -- and because they are "combined," neither can fully act on anything else.

Three Harmonies -- Three-Way Alliances

Three Branches team up to create a powerful elemental force:

  • Shen + Zi + Chen (申子辰) → Water Frame
  • Hai + Mao + Wei (亥卯未) → Wood Frame
  • Yin + Wu + Xu (寅午戌) → Fire Frame
  • Si + You + Chou (巳酉丑) → Metal Frame

Think of it as three departments merging into one task force -- their combined strength far exceeds what any of them could achieve alone.

Clashes -- Head-On Collisions

A clash is a direct confrontation between two Branches, signaling change, tension, or turning points:

  • Zi vs. Wu (子午) | Chou vs. Wei (丑未) | Yin vs. Shen (寅申) | Mao vs. You (卯酉) | Chen vs. Xu (辰戌) | Si vs. Hai (巳亥)

Here is a concrete example: if your Day Branch is Wu (午, Horse) and your Year Branch is Zi (子, Rat), they form a Zi-Wu clash. This does not automatically mean trouble -- a clash represents an intense exchange of energy that can bring movement and turning points. Whether the outcome is favorable depends on what your chart as a whole needs.

Punishment and Harm -- Subtler Friction

Beyond harmonies and clashes, Branches also interact through punishment (刑) and harm (害):

  • Punishment works like internal contradiction and self-undermining friction. The three main types are Yin-Si-Shen, Chou-Wei-Xu, and Zi-Mao
  • Harm is a quieter, behind-the-scenes disruption -- for example, Zi-Wei harm and Chou-Wu harm

These relationships may not be as dramatic as clashes, but they carry real weight in a professional analysis.

Putting It All Together

Imagine someone whose Day Branch is Mao (卯) and Hour Branch is Xu (戌) -- that is a Mao-Xu Six Harmony. In this pairing, Wood restrains Earth, so Xu Earth is weakened. But here is the subtle part: because both branches are "locked" together, Mao Wood is also tied up and cannot fully support other elements in the chart. If this person's chart needs Wood (say, Wood is their useful element), the harmony could actually reduce that support.

Now imagine a Luck Period or annual cycle brings You (酉) into the picture, clashing with the natal Mao -- that year is likely to bring significant changes or a turning point.

This is the subtlety of BaZi: the same Branch relationship can mean entirely different things depending on the chart it appears in.

Keep Exploring

The Earthly Branches are the most information-dense layer of BaZi. To keep building your understanding:

> Note: Branch relationships must be interpreted within the context of your complete chart. The same combination or clash can produce very different effects depending on your overall chart structure. A full chart reading reveals more accurate relationship dynamics.

Earthly Branches interact in complex ways. A full chart analysis considers all branch relationships together with Heavenly Stems for the complete picture. Curious about your own branch combinations? Try our free chart calculator.