The bazi si hai clash sets Si (巳 sì, the Snake) against Hai (亥 hài, the Pig). They face each other across the ring of Earthly Branches (地支 dìzhī), and their meeting is a clash (冲 chōng) of fire against water. Both are also movement branches, so this pairing carries a restless, journeying streak on top of the elemental fight. It marks change and travel, not calamity.
Si is a Fire branch; Hai is a Water branch. Water douses fire, so the headline of the si hai clash is a flame meeting a flood. But both branches hold several hidden stems, and their private quarrels give this clash more texture than a simple splash.
What Si and Hai actually are
Si, the Snake, is early summer Fire — bright, quick, and outwardly warm. Hai, the Pig, is early winter Water — deep, gathering, and inward. In the old imagery both belong to the travelling group, associated with roads and mobility, which is why charts carrying this clash so often involve movement, journeys, and shifting bases.
Each branch carries hidden stems (藏干 cánggān), and the clash is partly a fight among them. Here they are, from the reference tables with main qi first.
| Branch | Hidden stems (main qi first) |
|---|---|
| Sì 巳 (Snake) | Bǐng 丙 (Yang Fire), Wù 戊 (Yang Earth), Gēng 庚 (Yang Metal) |
| Hài 亥 (Pig) | Rén 壬 (Yang Water), Jiǎ 甲 (Yang Wood) |
The headline fight is Ren Yang Water inside Hai dousing Bing Yang Fire inside Si — flood over flame. There are undercurrents too. Si carries Geng Yang Metal, which meets Hai’s Jia Yang Wood in a metal and wood tension, and Si’s Wu Yang Earth tries to dam Hai’s Water. So the clash is water-fire on the surface, with metal-wood and earth-water currents running underneath. Every branch’s full cargo is listed on the hidden stems table if you want to trace each front yourself.
Why this clash reads as restless
Because Si and Hai both belong to the travelling group, the bazi si hai clash commonly surfaces as motion: journeys, changes of location, or work that keeps a person on the move. The water-fire core supplies the volatility, and the movement flavour gives it direction. Together they tend to shake a settled situation loose and send it somewhere new.
One curiosity worth knowing: Si and Hai are also listed among the six combinations — 巳 + 申 pairs the Snake with the Monkey toward Water, and 寅 + 亥 pairs the Pig with the Tiger toward Wood. Each of this clash’s branches has a natural ally elsewhere in the ring, and when that ally is present it can bind its branch and pull it partly out of the fight. That is one of the standard softeners a practitioner checks, covered on the six combinations page.
Where the Si–Hai clash shows up in a Ba Zi chart
The pillar decides what the clash colours.
Year branch
In the year, Si or Hai speaks to elders, roots, and the social sphere of early life. A clash here can mark a mobile upbringing or a family split between places.
Month branch
The month is the career palace and the seat of parents. This is where the travelling quality bites — career moves, transfers, and work that involves distance. Month-level Si–Hai is a common signature for people whose living is made on the road.
Day branch
The day branch is the spouse palace (夫妻宫 fūqīgōng) and your inner ground. A clash here touches partnership and home, often as a relationship marked by distance, travel, or the need for both people to keep room to breathe. It is a prompt to manage the coming and going, not a verdict on the bond.
Hour branch
In the hour, the clash speaks to children, later years, and private ambition. It can read as a mobile later life or ambitions that keep drawing you toward new ground.
Timing: a worked example with Si and Hai
The clash also arrives on a schedule. A chart with Hai in the day branch meets it in every Snake year, when the annual pillar (流年 liúnián) brings Si against the spouse palace; a natal Si meets it in Pig years. A Si or Hai luck pillar (大运 dàyùn) does the same for a full decade. Take the day-branch Hai case in a Snake year: the annual Bing Yang Fire runs into the natal Ren Yang Water, so the year tends to put heat under the partnership — travel apart, a relocation decision, a question of whose career moves first. Meanwhile the annual Geng Metal meets the natal Jia Wood, a second, quieter negotiation underneath. Read against the luck pillars, this tells you whether the restlessness is a season or a decade.
Reading it without fear
The classic mistake is to treat water quenching fire as pure loss. In charts we read, Si–Hai far more often marks a productive move — the relocation that opens a door, the journey that resets a stalled life. Water and fire can cancel, but managed well they alternate and keep a chart from stagnating.
It is worth saying plainly what this clash is not: it is not a prohibition on Snake–Pig marriages, since the year animal is one character out of eight and the day branch weighs far more; it is not a forecast of accidents or abandonment; and it is not a defect that needs curing. Context steadies it. Wood in the chart bridges water and fire, draining one and feeding the other; a combination can bind a branch and soften the clash. A strong Day Master travels the change rather than being swept by it, which is why strength is judged first. Review how the elements produce and control one another on the five elements of Ba Zi page, and how the Snake’s buried stems work on the Si branch hidden stems reference.
This is one of six pages covering each opposition. Start from the overview of the six clashes in Ba Zi, then compare the other movement-flavoured wood-metal pairing, the Yin–Shen clash, to see how a similar restlessness reads through a different axis.
Practical guidance
When a Si–Hai period arrives, assume travel and change are likely, and choose them rather than resist them. Make the move on your own terms, keep a partner informed if the clash sits in your day branch, and let the restlessness carry you toward a decision rather than into agitation. The friction is momentum waiting to be aimed.
Ba Zi (八字 bāzì) only earns its keep when you see exactly where a clash lands. Find the bazi si hai clash in your own chart and check which pillar it touches — plot it free with the calculator.