Incomplete Relational Gods Are the Norm, Not a Problem
In any given hexagram, not every type of relational god is guaranteed to appear across the six line positions. The five categories — Parents, Siblings, Descendants, Spouse/Wealth, and Officials/Ghosts — are distributed among the six lines, and repetition is perfectly normal, as is the complete absence of one category. Many beginners, upon finding that the yong shen (useful god) is missing from the hexagram, instinctively conclude that "the reading is flawed" or "information is incomplete," and rush to apply the Fei Fu method to fill in the gap. The impulse is not wrong, but there are several things to think through before going there.
In Liu Yao's sixty-four hexagrams, each hexagram has six lines. Once the Heavenly Stems and Earthly Branches are assigned through Na Jia (the stem-branch allocation system), the relational god attributes are derived from the palace to which the Day Master's hexagram belongs. The same Earthly Branch carries a different relational god attribute depending on which palace the hexagram falls under. Whether or not all five relational gods appear in a hexagram is therefore determined by the hexagram's own structure — it has nothing to do with how the reading was cast or what question was asked. Incomplete relational gods do not mean the hexagram is "defective"; it simply means the five-element arrangement of those six lines happens not to include that particular element.
The Origins and Basic Mechanics of the Fei Fu Method
The Fei Fu method comes from classical Liu Yao texts such as Zeng Shan Bu Yi (Additions and Deletions to the Book of Divination) and similar works. The core logic is this: when a particular relational god is entirely absent from the six lines of the hexagram, you consult the ben gong gua (the pure hexagram, or "eight pure hexagram," ba chun gua) of the palace to which the current hexagram belongs, locate the line in that pure hexagram bearing the needed relational god attribute, and treat that line's Earthly Branch as the "fu shen" (hidden god). The corresponding line in the current hexagram is called the "fei shen" (flying god), which sits above and covers the hidden one.
The steps are as follows:
- Identify which palace the current hexagram belongs to, then locate the corresponding eight pure hexagram.
- Find the line in the eight pure hexagram that carries the needed relational god attribute.
- That line's Earthly Branch becomes the fu shen, hidden beneath the corresponding line of the current hexagram.
- Use the relationship between the fei shen and fu shen to assess whether the fu shen can "emerge."
For example, if you are asking about finances and the Spouse/Wealth line is nowhere in the hexagram, go to the eight pure hexagram of the same palace, find the Wealth line there, and treat its Earthly Branch as the fu shen.
Whether the fu shen can take effect traditionally depends on whether the fei shen is "suppressing" or "nourishing" it, and on whether the day, month, or moving lines clash or combine with either. If the fei shen dominates the fu shen, the hidden god is considered suppressed and unlikely to emerge. If the fei shen nourishes the fu shen, or if the day or month clashes the fei shen or nourishes the fu shen directly, the fu shen has a chance to act.
The Real Conditions for Fu Shen to Take Effect
To be direct: the Fei Fu method is useful, but it is nowhere near as simple as "whenever relational gods are incomplete, fill them in."
First, the absence of the yong shen does not mean it is powerless. In some hexagrams, the outcome of the question is not determined by the yong shen at all but by the generating and controlling relationships among the other lines. Forcing in a fu shen under these circumstances introduces noise rather than clarity.
Second, the fu shen must meet the conditions for "emerging from hiding" (chu fu). The fu shen is inherently concealed; for it to act, something must uncover it — typically the day branch or a moving line clashing the fei shen open, or the fei shen nourishing the fu shen so it gains qi. Without these conditions, the fu shen essentially stays dormant, and invoking it in the reading adds little.
Third, monthly exhaustion (yue po) and emptiness (kong wang, i.e., xu kong or xun kong) apply to the fu shen just as they do to any other line. Some practitioners, after locating the fu shen, skip straight to judgment without checking its strength. That is cutting a step. A fu shen in a broken month or falling in an empty period has even less chance of surfacing.
My own working view is that the Fei Fu method is a supplementary tool, and its priority sits below the generating-and-controlling dynamics among the six lines of the current hexagram itself. If the hexagram already provides enough information, there is no need to invoke the fu shen. It is worth considering when the information is clearly insufficient and the direction of the question genuinely requires that missing relational god.
When the Fei Fu Method Tends to Mislead
A few common misapplications are worth calling out separately.
When the yong shen is also missing from the transformed hexagram, some practitioners continue hunting for a fu shen in the transformed hexagram as well. How to calculate a fu shen for the transformed hexagram is not settled across different schools, and real disagreement exists on this point. Do not treat any one approach as authoritative.
When a hexagram already contains two Spouse/Wealth lines, adding a third as a fu shen overloads the reading with information. Liu Yao interpretation depends on the clarity of the key signal; more lines, more potential contradiction.
When the fu shen's Earthly Branch already appears elsewhere in the current hexagram, some practitioners argue it is no longer truly "hidden" and should not be treated as a separate fu shen; others still handle it as one. The former position is logically cleaner.
The most common mistake of all is triggering the Fei Fu method solely because relational gods are incomplete, without looking at the overall structure of the hexagram. Missing a relational god is a necessary condition for invoking the method, but not a sufficient one. The further question is whether the absent god is actually decisive for this particular question.
The Fei Fu method is a mature technique within the Liu Yao system, and Zeng Shan Bu Yi gives it a reasonably thorough treatment. It is worth reading the primary source carefully rather than relying on second-hand summaries. But "mature" does not mean "universally applicable" — it addresses a specific kind of information gap and is not a standard step required in every reading.
Articles in this column are for cultural and educational purposes only and do not constitute life advice.