Understanding the Body Trigram and Use Trigram First
When you consult Plum Blossom Numerology (Meihua Yishu) about a matter, the casting produces a base hexagram and a transformed hexagram. The base hexagram contains two parts: the trigram on the side where the querent stands is called the body trigram (Ti Gua), and the other is called the use trigram (Yong Gua). Simply put, the body trigram represents the querent, while the use trigram represents the matter being asked about or the other party involved.
In a marriage reading, the body trigram is you, and the use trigram is the other person or the relationship itself. The generative and controlling dynamics between the two trigrams determine the direction of the relationship. This is the foundational logic of Plum Blossom Numerology (Meihua Yishu) — without understanding this layer, everything said about resonance and generation is just empty words.
The direction of Five Elements (Wu Xing) interactions matters: Wood generates Fire, Fire generates Earth, Earth generates Metal, Metal generates Water, Water generates Wood; Wood controls Earth, Earth controls Water, Water controls Fire, Fire controls Metal, Metal controls Wood. Every trigram carries a corresponding Five Elements (Wu Xing) attribute — Zhen (Thunder) belongs to Wood, Dui (Lake) to Metal, Li (Fire) to Fire, and so on. These are fundamentals that need to be memorized first.
What Is Ti Yong Bi He (Body-Use Resonance)?
"Bi He" (resonance) means the body trigram and use trigram share the same Five Elements (Wu Xing) attribute. For example, if the body trigram is Zhen (Wood) and the use trigram is Xun (also Wood), both belonging to Wood, that is Bi He.
In marriage divination, Bi He is generally a signal of stability and equal footing. The two parties are roughly matched in standing, similar in temperament, and neither obviously overpowers the other. Traditionally this is understood as being "well-matched" — similar backgrounds, less friction in daily life.
However, Bi He is not the best possible sign, which is a point many people get wrong. Its meaning is closer to "balanced" than "flourishing." If you want to know whether the relationship will progress quickly or whether the other person is enthusiastic and proactive, Bi He says: steady but slow, warmth only average.
Bi He also breaks into two situations:
- Both body and use trigrams are strong (Wang Xiang): with both parties in a strong phase, Bi He is auspicious and the marriage proceeds smoothly.
- Both body and use trigrams are weak (Shuai): with both weak, Bi He becomes mutually damaging — affinity is there but sustaining it is difficult.
So when assessing Bi He, you cannot simply see "same attribute" and draw a conclusion. You also need to check whether the month of divination favors that particular Five Elements (Wu Xing) attribute. If you cast in winter and both trigrams are Wood, Wood during the winter months (Hai-Zi months) still carries some residual energy but is generally weak — that winter Bi He carries far less force than one cast in spring.
The Big Difference Between Ti Sheng Yong and Yong Sheng Ti
"Ti Sheng Yong" means the body trigram's Five Elements (Wu Xing) attribute generates the use trigram. For instance, body trigram is Wood and use trigram is Fire — Wood generates Fire. That is Ti Sheng Yong.
In marriage, Ti Sheng Yong means the querent is the one giving, investing more in the other person, and contributing more emotionally. This sign is not inauspicious in itself — it shows genuine feeling — but from the querent's perspective, they are the giver while the other party receives. Over time the relationship may still be good, but it is easy to feel drained and imbalanced.
"Yong Sheng Ti" is the reverse: the use trigram generates the body trigram — for example, body trigram is Fire, use trigram is Wood, Wood generates Fire. This sign is considered one of the most favorable for the querent in marriage readings. The other person is proactive, emotionally invested, and willing to put in effort for the relationship. Traditionally Yong Sheng Ti is seen as auspicious, and marriage inquiries under this sign tend to go well.
A useful way to frame the difference: Ti Sheng Yong is like you pursuing the other person; Yong Sheng Ti is like the other person pursuing you. In modern terms, one puts the initiative in your hands, the other in theirs. Marriage is not purely a strategic game, of course, but this directional reading has real-world relevance.
Common Pitfalls in Actual Marriage Readings
The first pitfall is focusing only on the body-use relationship while ignoring the strength or weakness of the trigrams. As noted above, Bi He depends on strength, and so do generative and controlling dynamics. If the use trigram generates the body trigram but the use trigram is extremely weak that month, the "generative" force is faint and cannot simply be read as a strong auspicious sign.
The second pitfall is treating Ti Sheng Yong as straightforwardly inauspicious. Ti Sheng Yong indicates giving, not a bad relationship. Many long and stable marriages do involve one partner who is more actively nurturing — that is not a bad thing. The point is to inform the querent of this tendency so they can be emotionally prepared.
The third pitfall is forgetting the transformed hexagram. In Plum Blossom Numerology (Meihua Yishu), when there is a moving line (Dong Yao), the base hexagram transforms into a new hexagram, and the transformed hexagram also participates in the reading. Sometimes the body-use relationship looks auspicious in the base hexagram but reverses in the transformed hexagram. In that case, both must be read together: the base hexagram reflects the present, while the transformed hexagram reflects the trend or outcome.
One more situation worth addressing separately: if the body trigram controls the use trigram — called Ti Ke Yong — tradition holds that the querent can dominate the relationship, but it also hints at a degree of pressure or control. If the use trigram controls the body trigram — Yong Ke Ti — this is the least favorable sign for the querent. The other party may work against your interests, or the relationship may drain you. A marriage reading that yields Yong Ke Ti calls for caution — not that it necessarily fails, but the other person's attitude and motivations deserve careful attention.
The body-use relationship in Plum Blossom Numerology (Meihua Yishu) is ultimately a mapping of Five Elements (Wu Xing) generative and controlling dynamics onto human relationships. Once you have this logic down, combining it with specific hexagram imagery, line positions, and timing cycles gives your marriage readings real substance.
Articles in this column are for cultural and educational purposes only and do not constitute life advice.