What is Bi Jian (比肩) in BaZi? A friend backing you up — not a house to live in
Question this answers — "比肩是什么意思" (what does Bi Jian mean) ·
"比肩是什么意思八字" (what does Bi Jian mean in BaZi) · "八字中的比肩是什么意思"
(what does Bi Jian mean in a BaZi chart)
(比肩 / Bi Jian — usually translated "Companion" or "Rob Wealth's sibling" — is the
element that matches the Day Master's own element and polarity: the same element, standing
on the same side.)
The short answer
The classics place 比肩 in the family-role mapping the same way most modern write-ups do —
as the sibling — but the reason is worth reading, because it sets up the more useful point
that follows:
至於比肩為兄弟，又理之顯然者。
"As for Bi Jian being one's sibling — this is a self-evident principle."
— 子平真詮評註 (in 論宮分用神配六親, on matching the Ten Gods to family roles)
Self-evident because the logic is simple: the sibling is the person who shares your same
standing — same generation, same "element" of the family, so to speak. That's literally what
比肩 is in the chart: the same element as you, standing beside you.
Why "a friend" is the right image — and its limit
The more useful classical statement about 比肩 isn't about family roles — it's about how
much support it actually provides, compared to the other kind of support a chart can have:
得一比肩，不如得支中一墓庫，如甲逢未、丙逢戌之類。… 蓋比劫如朋友之相扶，通根如室家之可住；
干多不如根重，理固然也。
*"Getting one Bi Jian [companion stem] is worth less than getting one tomb-vault root
in the branches — such as Wood (甲) meeting Earth-未, or Fire (丙) meeting Earth-戌. …
Because Bi/Jie (比劫, Companion and Rob Wealth together) are **like the support of
friends, while having an actual root is like having a house to live in**. Many stems
above are worth less than one heavy root below — this is simply how it is."*
A friend standing next to you is real support. But a friend is not the same as having your
own house. 比肩 helps — it is not nothing — but the classics are explicit that it is a
lighter kind of support than an actual root in the branches, even though both get lumped
together as "the Day Master has help" in casual reading.
What this means for reading a chart with a lot of 比肩
This is also why the classics keep 比肩 and its family (比劫, Companion-and-Rob-Wealth
together) as a category of support to be weighed, not a single yes/no flag. Several 比肩
stems can still add up to less real backing than one well-rooted branch — the quantity of
stems doesn't automatically outrank the quality of a root, which is the exact point behind
「干多不如根重」above.
How we read it
KLifeMap's engine counts 比肩 as one input among several when it reads how much support the
Day Master actually has — the same "friend, not house" distinction the classics draw between
stem-only companions and true branch roots. A chart isn't read as strong just because
several 比肩 stems appear; what they're weighed against is what decides that.
What this answer does not do
- It does not tell you whether your Day Master is well-supported. That takes your full
four pillars — how many 比肩/比劫 you have, and whether you also have actual roots.
- It does not cover 劫財 (Rob Wealth — the opposite-polarity sibling of 比肩) in detail,
though the classics group the two together as 比劫 for the purpose above.
- Translations here are ours. The Chinese is quoted verbatim so it can be checked against
the original — 子平真詮評註.
Source text: 子平真詮 (Ziping Zhenquan), Shen Xiaozhan, Qing dynasty; commentary by Xu Leyu
(徐樂吾), Republican era.
This is an explanation of classical method, not a prediction and not financial, medical, or
legal advice.