Where Ba Zi (八字 bāzì) reads the map you were born with, Qi Men Dun Jia (奇门遁甲 qí mén dùn jiǎ) reads the terrain for a specific move. Qi men timing is the practical face of the system: the art of choosing when to act and which way to face when you do. In classical practice this is called 选择 (xuǎn zé, “selecting” — election). This page explains how the method works in principle: how auspicious gates become directions, and how a practitioner matches a useful symbol to the matter at hand.
One rule frames everything below. A gate or star only means something once a real cast plate has placed it in a specific palace for a specific hour. We explain the machinery here; we do not compute a dated plate in prose. When you want an actual bearing for an actual moment, that comes from a plate, not from a paragraph.
Timing: the plate is a picture of one moment
A Qi Men plate is fixed by the moment it is cast. The solar term (节气 jié qì) of the hour decides whether the board runs as Yang Dun (阳遁 yáng dùn) or Yin Dun (阴遁 yīn dùn); the day’s position sets the yuan (元 yuán); together they fix the formation number that seeds the whole board. Because that derivation is deterministic, every hour carries a different arrangement of gates, stars, and deities over the Nine Palaces.
So qi men timing is not “pick a lucky hour” in the abstract. It is: cast the moment you are considering, find the symbol that stands for your matter, and read whether the terrain around it is favourable. A good hour for asking for money is not automatically a good hour for a difficult conversation, because a different symbol governs each. The plate for the same hour can be encouraging for one question and discouraging for another.
The hour also carries the 值使 (zhí shǐ, Duty Gate), the gate paired to the Chief star and anchored to the palace of the hour’s leading stem. The Duty Gate is where the plate says the current of the moment is actually flowing, so it weighs heavily when you are choosing among candidate hours. For how the board itself is built from solstice, yuan, and formation number, see Yang Dun and Yin Dun.
八字 · Four Pillars
Start with your own chart. Plot your Ba Zi free — exact solar-term accuracy, in your browser. The birth chart is where every reading begins.
The Nine Palaces sit on the Luo Shu (洛书 luò shū) square, and each of the eight outer palaces holds a fixed compass direction. When a plate places a gate over a palace, it also places that gate’s quality in a direction. This is the bridge from the action layer to real-world bearings: to travel or set out well, you face the direction of an auspicious gate.
The three auspicious gates — the 三吉门 (sān jí mén, “three lucky gates”) — are the ones you want to face:
Gate
Name
Nature
开 Kāi
Open
✔ beginnings, career
休 Xiū
Rest
✔ rest, retreat
生 Shēng
Life
✔ growth, wealth
The three to avoid facing are 死 (sǐ, Death — endings and stagnation), 惊 (jīng, Fright — shock and disputes), and 伤 (shāng, Harm — injury and conflict). The remaining pair are situational: 杜 (dù, Block) favours concealment and 景 (jǐng, Scenery) favours visibility, so each helps or hinders depending on what you are doing. The full set is laid out in the Eight Gates of Qi Men.
In practice you read it both ways. If a plate puts 生门 (shēng mén, the Life Gate) in the west, west is a favourable bearing to set out toward for a wealth matter. If it puts 死门 (sǐ mén, the Death Gate) in the direction you had intended to travel, that is the plate’s quiet suggestion to wait or reroute. The palace under the gate matters too: a benefic gate over a weak or clashed palace is a promise the terrain cannot fully keep.
Matching the useful symbol to the matter
Everything turns on picking the right 用神 (yòng shén, useful symbol) — the palace or symbol that represents your specific question. Choose the wrong symbol and you read the wrong corner of the board. Qi Men assigns settled symbols to common matters:
Matter
Useful symbol (用神)
Self / the querent
值符 (zhí fú) Chief; 乙 (yǐ), or the day stem’s palace
Career / officialdom
开门 Open Gate; the Chief
Wealth / business
生门 Life Gate; the palace it sits over
Marriage / partnership
六合 (liù hé) Liu He; the 乙/庚 (gēng) relationship
Health / illness
天芮 (tiān ruì) star; 死门; 白虎 (bái hǔ)
Travel / direction
the auspicious gate’s direction; the 值使 Duty Gate
Lost items / theft
玄武 Xuan Wu
Once the symbol is fixed, the reading is disciplined. Name the symbol’s palace and what rides on it — star, gate, deity, stem. Check whether its element is prosperous 旺相 (wàng xiàng) or exhausted 休囚 (xiū qiú) for the season, because a benefic gate in a dead element is a promise the season cannot keep. Read which palaces produce or clash with it. Only then give a tendency and one practical move — a bearing to face, or an hour to prefer. Qi men timing yields terrain, never a verdict.
Schools differ, so name the method
Election is where school choices show. 转盘 (zhuǎn pán, rotating-plate) and 飞盘 (fēi pán, flying-plate) traditions move the stars and gates differently, so the same hour can hand you different bearings. Solar-term handling forks as well — 拆补法 (chāi bǔ fǎ) and 置闰法 (zhì rùn fǎ) are genuinely different conventions. None of this is a flaw in the system; it means a careful practitioner names the method rather than pretending there is only one true board. When the plate cannot support a bearing cleanly, the honest answer is to say so and widen the window.
Qi Men reads the terrain for a decision; Ba Zi reads the map you were born with, and the two work best together. Start with the map: plot your own four pillars free with the Ba Zi calculator, then read how the strategy art sits alongside your natal picture in Qi Men Dun Jia versus Ba Zi. Knowing the map is what makes any question of timing and direction worth asking well.
