BaZi root (Tong Gen): count the root first, then talk about strength
A BaZi root (tong gen, 通根) means the Day Master (日主, the day stem that stands for you) finds its own element among the hidden stems (藏干, the stems tucked inside each branch) of the four branches. Find one and the chart is rooted; find none and it is rootless. A match in a branch's main qi (本气, its leading hidden stem) is a main qi root, the strongest kind; a match only in the middle or residual qi is a small root. Resource (印星, the element that produces the Day Master) is support, not a root. A root is not the same as a strong chart, and rootless does not mean the chart must follow another element: 15.7% of rootless charts in our count were still strong, all of them held up by Resource.
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At a glance
| Root position | Strength | Notes |
|---|---|---|
| Month branch main qi root | Strongest | The month command carries the most weight; 85.2% of these charts are judged strong |
| Day branch or hour branch main qi root | Strong | Close to the Day Master, but a day-branch root splits almost evenly |
| Year branch main qi root | Lightest | The lightest of the four branches; it still counts as a root |
| Middle or residual qi root | Small root | Secondary hidden stems; same element, but limited support |
| None of the four branches | No root | Check Resource and Companions first; do not jump to a Follow chart (从格) |
- Tong Gen (通根)
- The Day Master finds its own element among the hidden stems of the four branches
- Main qi root (本气根)
- The branch's leading hidden stem shares the Day Master's element; the strongest root
- Residual qi root (余气根)
- A later hidden stem shares the element; a small root only
- No root (无根)
- No hidden stem in any of the four branches shares the Day Master's element
- Resource is not a root
- Resource (印星) feeds the Day Master and counts as support; rooting is read from hidden stems only
Data: how common roots are, and what a root actually says
In our 2,000 charts, 185 were rootless, or 9.3%. Of those, 84.3% were judged weak and 15.7% strong; all 29 strong ones had Resource.
Charts with only middle or residual qi roots numbered 666, or 33.3%; 1,149 charts, or 57.5%, had at least one main qi root. The first group came out 35.4% strong and 64.3% weak; the second, 58.2% strong and 41.6% weak. The firmer the root, the higher the strong share, but no group was all strong.
Charts with two rooted branches are the most common. Across the four branches: 0 roots 9.3%, 1 root 27.4%, 2 roots 35%, 3 roots 22.1%, 4 roots 6.3%. Counting roots is only the first step; which pillar holds the root and whether it is main qi matter more.
Two numbers are easy to misread. A month-branch main qi root appeared in 412 charts, 20.6%, and 85.2% of them were strong. A day-branch root appeared in 967 charts, 48.4%, with 48.9% strong and 50.9% weak. The month command root is the most powerful; the root right under you is almost perfectly split. And 85.3% of weak charts still had a root.
Simulated charts: our BaZi calculator generated 2,000 random birth times (birth years 1950–2010 uniformly random, random birth time, half male/half female, Beijing true solar time), cast each chart and judged strength and the Useful element by traditional rules, then counted the results. These are simulated results, not a survey of real people and not a measure of prediction accuracy. A root was any hidden stem in a branch that shares the Day Master's element, counting main, middle and residual qi, and all four branches including the day branch were checked. A main qi root means the branch's primary hidden stem shares the Day Master's element. Calculation version: our BaZi calculator after the Oct 15, 2026 update (the same rules the site uses now; rechecked with site version v73 on Oct 20, 2026), random seed 20261014. To reproduce: rerun the same version with the same seed and the results match exactly; you can check any single chart by entering the same birth time in our BaZi calculator.
How do you count a root? Match the hidden stems, branch by branch
Counting a root is one job: open the hidden stems of all four branches and look for the Day Master's element. Write down the day stem first, Geng Metal for instance, then read the hidden stems in the year, month, day and hour branches. Mao hides Yi, Chen hides Wu, Yi and Gui, Zi hides Gui, and another Mao hides Yi: no Metal anywhere, so the chart is rootless. One hit is enough, whether or not that stem is exposed on top.
The second step is size and position. If the branch's main qi shares the Day Master's element, that is a main qi root. If the match only appears in the middle or residual qi, it is a small root. The month branch (月支, the branch that rules the birth season, also called the month command) carries the most weight, then the day branch (日支, the spouse palace) and the hour branch, then the year branch, which weighs the least. A root is a root; strength is strength, decided by the month command, Resource, Companions and the total scores.
A root does not make a strong Day Master: the easiest step to get backwards
Among weak charts, 85.3% actually have a root. In our 2,000 charts a root is normal and a rootless chart is the minority. A root only says the Day Master has same-element support somewhere in the branches; it does not say the support is enough. Whether the month branch drains or feeds it, how heavy Resource is, and how much Wealth (财, what the Day Master controls), Officer/Killings (官杀, the element that controls the Day Master) and Output (食伤, Eating God and Hurting Officer, what the Day Master produces) press on it all change the answer.
Sitting on a root is no different. Of the 967 charts with a root in the day branch, 48.9% came out strong and 50.9% weak, almost a coin flip. The day branch is close to the Day Master, but it is still only one of four branches and cannot settle strength by itself. Say “the day branch has a root, so the chart can carry Wealth and Officer” and you will often be wrong.
A month-branch main qi root is the strongest root
When the month branch's main qi is the Day Master's own element, 85.2% of those charts are judged strong. The month command has the biggest say, and the main qi is the leading hidden stem, so this is the most powerful root a chart can have.
But 85.2% is not all of them; 14.8% still came out weak. Those charts hit exceptions: the month branch is clashed, combined into a structure that drains the Day Master, or a finer table that looks at the day stem, birth month and birth hour together changes the call. A month main qi root is a very good card, not an automatic verdict. Main qi roots in the day and hour branches sit in the middle, and a main qi root in the year branch is the lightest.
A rootless chart is not always weak, and it is not automatically a Follow chart
Of the 185 rootless charts, 84.3% were judged weak and 15.7% strong. All 29 of the strong ones had Resource. The Day Master has no root of its own in the branches, but Resource keeps generating it, so something is holding it up from behind. You cannot call every rootless chart weak on sight.
A special structure is rarer than people think, and a Follow chart (从格, following the dominant element when the Day Master is extremely weak) is one kind. Only 9.7% of rootless charts took a special structure: 7 followed Seven Killings (从杀), 5 followed Wealth (从财), 4 followed Output (从儿), 1 was a two-element chart (两气成象), and 1 transformed into Earth (化土格). The 12 charts with no root and no Resource (0.6%) were all judged weak, and 41.7% of them still counted as special structures. Following or not is a whole-chart question.
Roots loosen, and roots get refilled
A root is not carved in stone. When a branch is clashed (冲, one of the six clashes, two branches directly opposing) or combined (合, two or three branches joining), the root loosens and the support it offered can be pulled away. When a luck cycle or annual pillar reaches a branch of the Day Master's element, it refills the root, and people often feel their footing come back during those years.
How much a root loosens has no universal ruler. The same root loosens differently from chart to chart, depending on what clashes or combines with it, what the chart favors, and the luck cycle. The order of reading does not change: judge strength first, then weigh how much power the root, Resource and Companions each carry.
Common view vs. our view
| Common view | Our view | Why |
|---|---|---|
| A root means a strong Day Master that can carry Wealth and Officer | A root only means support exists; strength is scored separately | 85.3% of weak charts still had a root |
| No root means a weak chart, probably a Follow chart | Most rootless charts are weak, but not all | 15.7% of the 185 rootless charts were strong, all 29 with Resource |
| A day-branch root is the one that counts; sitting on a root means strong | The day branch is close, but it cannot decide strength alone | 967 day-branch-root charts: 48.9% strong, 50.9% weak |
| A month-branch main qi root guarantees a strong chart | It is the strongest card, but the whole chart still counts | 85.2% of those 412 charts were strong; 14.8% were not |
Two real charts
Yi Mao (乙卯) · Geng Chen (庚辰) · Geng Zi (庚子) · Ji Mao (己卯) (male, Apr 24, 1975, 06:30, Beijing)
No root: not one of the four branches contains Metal. The Day Master is Geng Metal. The year branch Mao hides Yi (Wood), the month branch Chen hides Wu, Yi and Gui, the day branch Zi hides Gui (Water), and the hour branch Mao hides Yi (Wood). The month stem Geng Metal is a Companion, but being exposed above ground does not give it a root.
Rootless, yet this is not read as a Follow chart. The month branch Chen's main qi Wu Earth and the hour stem Ji Earth are Resource; Earth produces Metal, so the Day Master has support from behind. By our rules the chart is weak (scores: support 3.2, pressure 3.8), not extremely weak, and it does not take a Follow structure. Earth is the Useful element (用神, the element the chart needs most), Metal is favorable, Water is unfavorable.
Read it as rootless Geng Metal held up by Resource. Resource is strong enough that the chart does not collapse; the picture is more “not enough confidence of its own, so environment, elders and study fill in.” The footing comes back most easily when a luck cycle or annual pillar reaches Shen or You, Metal branches that refill the root.
Bing Yin (丙寅) · Geng Yin (庚寅) · Xin Si (辛巳) · Ren Chen (壬辰) (male, Feb 6, 1986, 09:15, Beijing)
Only one small root shows up in this chart. The Day Master is Xin Metal. The year branch Yin and the month branch Yin both hide Jia, Bing and Wu; the hour branch Chen hides Wu, Yi and Gui. None of them holds Metal. Only the day branch Si, which hides Bing, Geng and Wu, carries Geng Metal as a middle qi root.
The root sits under the Day Master, but it is not steady. The month stem Geng Metal is Rob Wealth and is exposed. The day branch Si's main qi is Bing Fire, which is Direct Officer (正官, the element that controls the Day Master with opposite polarity) to Xin Metal, and the year stem Bing Fire is a second exposed Direct Officer. Yin month puts Wood in command, so Wealth is strong. By our rules the chart is weak (scores: support 2.25, pressure 4.75). Earth is the Useful element (Resource, here the hour branch Chen Earth), Metal is favorable, Wood and Fire are unfavorable.
A root plus a weak chart means Resource comes first. Si's main qi Fire is actively melting Metal, so this middle qi root helps only a little; “the day branch has a root” is no reason to call the chart strong. Use Chen Earth's Resource to steady the base, then wait for Metal to lend a hand. This is what “a root is not strength” looks like in a real chart.
FAQ
I have zero roots in my chart. Does that mean I can't hold on to money or save anything?
Slow down. In our 2,000 charts, 185 were rootless, just 9.3%. Of those, 84.3% were judged weak, but 15.7% were strong, and all 29 strong ones had Resource. No root only means the Day Master has no same-element support in the branches. Whether you can carry Wealth depends on Resource, Companions, the month command and what the chart favors. If money worries you, look at whether Wealth is favorable or unfavorable; it cannot be judged from one factor.
My day branch has a root, but a reader still called my chart weak. Did they get it wrong?
Not necessarily. Of the 967 charts with a day-branch root, 48.9% were strong and 50.9% weak, almost an even split. The day branch is close to the Day Master, but it is one of four branches. The month branch may be draining it, Resource may be thin, or Wealth, Officer/Killings and Output may be heavy enough to pull the result back. Check the support and pressure scores and the Useful element instead of staring at the day branch alone.
My month branch's main qi is my own element. Am I definitely strong, so I can stop reading?
It is the strongest root you can have, but not a free pass. Of the 412 charts where the month branch's main qi matched the Day Master, 85.2% were judged strong and 14.8% were not. A clash on the month branch, a combination that drains the Day Master, or a finer reading by day stem, month and birth hour can change it. Add up Resource and Companions against Wealth, Officer/Killings and Output, then confirm the Useful element.
My luck cycle brings my root. Will those years definitely go smoothly?
A root arriving is extra footing, not a guarantee. When a luck cycle or annual branch matches the Day Master's element, the Day Master gains support in the branches, and people often feel steadier. But whether that cycle's element is favorable decides whether steady turns into good. If your chart is already strong, more of your own element is usually not what it needs. Read it with the natal strength, the chart's favorability, and any clashes or combinations in those years.
Common mistakes
- A root means a strong Day Master: 85.3% of weak charts still had a root; root and strength are two different questions.
- No root means weak for sure, and probably a Follow chart: 84.3% of rootless charts were weak, 15.7% strong, and only 9.7% took a special structure.
- A day-branch root makes the chart strong: among 967 charts with one, 48.9% were strong and 50.9% weak, almost half and half.
- A month-branch main qi root must mean strong: 85.2% of those 412 charts were strong, but 14.8% were not.