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Fortune Teller | Determining Bazi Structures

In Bazi astrology, determining the Bazi structure is an indispensable step, primarily assessed through the strength or weakness of the elements.

Bazi centers around the Day Master. Elements that generate or are identical to the Day Master are considered allies, while the opposite elements are considered adversaries. The structure is determined by the strength or weakness of these allies and adversaries. They are typically classified into two main categories: Regular Structures and Special Structures. In Regular Structures, both allies and adversaries are present, and the Day Master is either strong or weak. In Special Structures, allies or adversaries dominate, making the Day Master extremely strong or weak. An extremely strong Day Master indicates a Special Flourishing Structure, while an extremely weak one indicates a Following Structure.

Determining Regular Structures involves Three Inspections:

  • Inspection of the Command: This refers to examining the Month Branch. If the Day Element is born in a month favorable to itself or its allies, it’s considered in command. Otherwise, it’s out of command. For example, Jia or Yi born in the months of Hai, Zi, Yin, or Mao are in command because they are supported by or identical to these branches.
  • Inspection of the Terrain: This relates to the Earthly Branches, excluding the Month Branch. With three remaining branches, if two or all three are allies, it’s considered holding the terrain; if they’re mostly adversaries, it’s losing the terrain.
  • Inspection of the Momentum: This pertains to the Heavenly Stems. Excluding the Day Master itself, if the other stems are predominantly allies, it’s considered holding the momentum; if they’re mostly adversaries, it’s losing the momentum.


After these inspections, a Bazi with a Regular Structure can have its Day Master’s strength assessed. The basic principle is: if two or more of command, terrain, and momentum are held, the Day Master is strong. If two or more are lost, the Day Master is weak.

Sometimes, even if two out of three aspects are held, the Day Master could still be weak, and vice versa. Therefore, additional principles must be considered when assessing the Five Elements structure.

Five principles

Principle of Stem Revelation: This refers to when an Earthly Branch’s hidden stem appears in the Heavenly Stems. When allies and adversaries are evenly matched, the first aspect to check is whether the month command reveals a stem. For instance, if a Bazi with a Bing Day Master has You in the month branch and Geng or Xin appears in the Heavenly Stems, this is considered Direct Wealth assuming the command.

Principle of Root Support: When a Heavenly Stem’s Ten God appears again in the Earthly Branches, it’s considered rooted. A rooted stem is stronger than one without roots.

Principle of Assembly: Earthly Branch combinations, like three-harmonies or half-combinations, directly affect the relationship between allies and adversaries. If an assembly forms without changing, it’s considered as-is; if it forms and transforms due to a guiding stem, the transformation is acknowledged, and the branches are treated as uniform in terms of allies or adversaries.

Principle of Proximity: The three positions closest to the Day Master (Day Branch, Hour Stem, and Month Stem) have direct impact. If these are personal gods (like Resource or Parallel), even if other aspects are unfavorable, the Day Master may still be considered strong.

Principle of Sandwiching: A strong Day Master can be weakened if flanked by adversarial forces, known as sandwiching.

For Special Structures, a chart entirely composed of allies or adversaries is considered extreme. A Pure Flourishing Structure involves a chart dominated by allies, making the Day Master extremely strong. A Following Structure is when the chart is filled with adversaries, rendering the Day Master extremely weak.

Understanding the Bazi structure and the preferences of different structures allows for fortune prediction based on the Luck Pillars in relation to the annual cycles.

For further reading: What is a Following Structure?

Identifying the Bazi structure, coupled with knowledge of the likes and dislikes of each structure, enables the prediction of fortune and misfortune based on the transit through the Luck Pillars.

Next Recommendation

  1. How to Calculate the Life Hexagram of Your Destiny
  2. People’s Na Yin Five Elements Life Hexagram Query Table
  3. How to Construct the Four Pillars
  4. How to Calculate Your Fortune Using Bazi

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