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Bazi structure · Primary qi

Structure from Primary Month-Branch Qi (本氣取格)

Understand primary-qi structure selection, the evidence that makes the month branch’s main hidden stem operative, and the limits of using it mechanically.

Simplified Chinese
月支本气取格
Traditional Chinese
月支本氣取格
Pinyin
Yuè Zhī Běn Qì Qǔ Gé
Also known as
Main-qi pattern selection · Month-branch principal qi

Editorially reviewed:

Overview

Primary-qi selection takes the principal hidden stem of the month branch as the first structure candidate. The method is stable only when the hidden-stem table and school are explicit, and the candidate still must be tested for seasonal authority, exposure, roots, support, control, obstruction, and stronger competing evidence.

At a glance

Reference
Principal hidden stem of the month branch
Prerequisite
Declared hidden-stem table
Role conversion
Compare principal stem with the Day Master
Validation
Season, exposure, roots and connection
Counterevidence
Stronger revealed or mixed-qi structure
Boundary
Primary does not mean automatically successful

Define primary qi before selecting it

Identify the month branch and its principal hidden stem using one documented table.

Convert that stem into its exact Ten-God relation to the Day Master before naming a structure.

  • Keep the source table versioned.
  • Do not infer the role from the branch animal.

Primary qi supplies priority, not completion

Its month position gives seasonal relevance, but visibility, rooting, and access determine how clearly it can organize the chart.

A principal stem that is obstructed or unsupported may yield a weak candidate rather than a formed structure.

  • Separate priority from capacity.
  • Check the entire functional chain.

Compare exposed and mixed-qi alternatives

A revealed middle or residual stem may become more operational under a school that prioritizes month-command exposure.

Show why primary qi remains preferred or report a mixed structure when the evidence cannot be reduced honestly.

  • Preserve competing candidates.
  • State why one method prevails.

Do not turn the main qi into a destiny rank

Primary qi does not make a pattern pure, high-grade, favorable, or socially prestigious by itself.

Quality and life application require separate chart evidence and cannot guarantee real-world results.

  • No rank from one hidden stem.
  • No deterministic outcome claims.

Sources and editorial basis

  1. 《淵海子平》 (Yuanhai Ziping)
    《淵海子平》支中人元、月令與取格諸論：月支本氣可立候選，成立仍視透藏與全局A foundational Ziping reference for branch months, hidden stems, roots, and stem-branch relationships.
  2. 《三命通會》 (Sanming Tonghui)
    《三命通會》人元司令與月支藏干諸論：本氣、中氣、餘氣及透出層次須分列A historical compilation covering stems and branches, Ten Gods, Nayin, Shen Sha, and multiple classical pattern systems.
  3. OpenFate Editorial Methodology
    月支本氣取格頁公開藏干表、十神換算、候選條件與替代取格方法OpenFate separates deterministic chart calculation, traditional interpretation, and modern editorial explanation.
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