Of all the concepts in Bazi, chart strength is the one that shapes almost every interpretation. It's the question that sits behind every reading: is your Day Master strong or weak? The answer determines which elements are favourable for you, which are unfavourable, and how every interaction in your chart should be understood. Get this right, and the rest of the chart starts to make sense. Get it wrong and everything else falls apart.
What Chart Strength Means
Your Day Master is one of the five elements. Like any element, it can be strong or weak depending on its environment. A strong Day Master has plenty of energy and support around it β it's like a fire burning on a hot, dry day with plenty of fuel. A weak Day Master is short on energy and support β it's like a fire struggling to stay lit in the rain with nothing to feed on.
Chart strength isn't about whether you're a "strong person" or a "weak person" in everyday terms. It's about the elemental balance of your chart. A strong Day Master means that element has a lot of presence and support in the chart. A weak Day Master means it doesn't. That's it.
Why does this matter so much? Because what your Day Master needs depends entirely on its strength:
Strong Day Master
Needs to be drained or controlled. Its favourable elements are the ones that output its energy (Eating God, Hurting Officer), the ones that control it (Direct Officer, Seven Killings), and the ones it controls (Direct Wealth, Indirect Wealth). Having more support would just make it overwhelming.
Weak Day Master
Needs to be supported and strengthened. Its favourable elements are the ones that produce it (Direct Resource, Indirect Resource) and the ones that match it (Friend, Rob Wealth). Without support, it can't handle the pressure of wealth or authority.
Same chart, different strength reading, completely different favourable elements. That's why this question comes first.
The Four Factors That Determine Strength
Chart strength is assessed by looking at four main factors. None of them works in isolation β you have to weigh all four together.
Factor 1
The Season
Month Branch
The single most important factor. Your Day Master's strength is heavily influenced by the season you were born in, which is represented by the Month Branch. Every element has a season where it's naturally strong and one where it's naturally weak.
Wood is strong in spring (Yin, Mao, Chen branches) and weak in autumn (Shen, You, Xu).
Fire is strong in summer (Si, Wu, Wei) and weak in winter (Hai, Zi, Chou).
Earth is strong in the transitions between seasons (Chen, Xu, Chou, Wei) and weakest in spring.
Metal is strong in autumn (Shen, You, Xu) and weak in summer (Si, Wu, Wei).
Water is strong in winter (Hai, Zi, Chou) and weak in late summer/autumn (Shen, You, Xu).
If your Day Master is born in its strong season, it starts with a natural advantage. If it's born in its weak season, it starts at a disadvantage. The Month Branch carries so much weight because the season determines the baseline energy available to every element in the chart.
Factor 2
Root
ιζ Ή (Tong Gen) β "Connecting Root"
The second most important factor. A Day Master is considered "rooted" when its element β or an element of the same type β appears in one or more of the Earthly Branches (including hidden stems). The branches represent the ground, and having roots in the ground gives an element stability and staying power.
For example, if your Day Master is Jia (η², Yang Wood) and one of your branches is Yin (ε― , Tiger) β which contains Jia as its Main Qi β your Day Master has a strong root. It's grounded. Even if the season isn't favourable, a well-rooted Day Master has more resilience than one floating without any connection to the branches.
A Day Master with no root at all is like a tree planted in a pot instead of the ground β it can still grow, but it's vulnerable and dependent on external support.
Root strength varies:
A branch where your Day Master's element is the Main Qi gives the strongest root
A branch where it's the Middle Qi gives a moderate root
A branch where it's the Residual Qi gives a weak root
The more roots your Day Master has, and the stronger those roots are, the more grounded and resilient it is.
Factor 3
Support from Other Elements
ηζΆ
Beyond the season and the roots, you look at how many other elements in the chart support the Day Master. The two types of support are:
Resource energy β the element that produces your Day Master. If your Day Master is Wood, then Water (which nourishes Wood) is your Resource. Strong Resource in the stems or branches boosts the Day Master.
Friend energy β the same element as your Day Master. If your Day Master is Wood, then other Wood in the chart is Friend energy. It reinforces the Day Master by adding more of the same type.
The more Resource and Friend energy present in the visible stems, hidden stems, and branches, the stronger the Day Master becomes. Count them up and see how much support is there.
Factor 4
Pressure from Other Elements
ε ζ³θ
The flip side of support is pressure. Elements that drain, control, or oppose the Day Master weaken it:
Output energy β the element your Day Master produces. This drains the Day Master's energy, like a river flowing outward.
Wealth energy β the element your Day Master controls. Acquiring wealth takes effort and energy, so strong Wealth pressure weakens the Day Master.
Authority energy β the element that controls your Day Master. This is direct pressure β like a weight sitting on top of it.
The more Output, Wealth, and Authority energy present in the chart, the weaker the Day Master becomes. These elements are actively pulling energy away from it or pressing down on it.
Putting It All Together
To assess chart strength, you weigh all four factors against each other:
Factor
Effect
Is the season favourable?
Strengthens (+)
Does the Day Master have strong roots?
Strengthens (+)
Is there a lot of Resource and Friend support?
Strengthens (+)
Is there a lot of Output, Wealth, and Authority pressure?
Weakens (β)
If the positives heavily outweigh the negatives, the Day Master is strong. If the negatives outweigh the positives, it's weak. If it's roughly balanced, you have a moderate Day Master, and the reading requires more nuance.
In general, the Month Branch carries the most weight β it's often said that the Month Branch accounts for roughly half of the strength assessment. But a Day Master that's born in a weak season can still be strong if it has deep roots and plenty of support. And a Day Master born in a strong season can still be weak if it's under heavy pressure from controlling or draining elements with little support around it.
Strong Day Master β What It Needs
A strong Day Master has more energy than it needs. It's like a river that's overflowing its banks β it needs outlets and channels to direct the excess.
Favourable elements for a strong Day Master:
Output (Eating God, Hurting Officer) β gives the excess energy something productive to do
Wealth (Direct Wealth, Indirect Wealth) β provides goals and rewards for the Day Master's energy
Authority (Direct Officer, Seven Killings) β provides structure and discipline
Unfavourable elements for a strong Day Master:
Resource (Direct Resource, Indirect Resource) β adds more energy to an already overflowing chart
Friend (Friend, Rob Wealth) β reinforces what's already too strong
In practical terms, a strong Day Master person tends to do well when they have challenges to tackle, goals to pursue, and structure to channel their energy. They can handle pressure and responsibility. Too much support or comfort can actually make them stagnate.
Weak Day Master β What It Needs
A weak Day Master has less energy than it needs. It's like a candle flame in a draughty room β it needs protection and fuel to stay lit.
Favourable elements for a weak Day Master:
Resource (Direct Resource, Indirect Resource) β provides nourishment and support
Friend (Friend, Rob Wealth) β provides reinforcement and allies
Unfavourable elements for a weak Day Master:
Output (Eating God, Hurting Officer) β drains what little energy there is
Wealth (Direct Wealth, Indirect Wealth) β too much to handle, like trying to carry more than you can lift
Authority (Direct Officer, Seven Killings) β crushing pressure on an already strained Day Master
In practical terms, a weak Day Master person tends to do well when they have support systems, education, and allies around them. They benefit from environments that nurture rather than challenge. Heavy responsibility or intense pressure without backup can overwhelm them.
The Exception β Follow Charts
There's one important exception to the strong/weak framework. In some charts, the Day Master is so overwhelmingly weak β surrounded on all sides by controlling and draining elements with virtually no support β that it stops trying to be strong altogether and instead "follows" the dominant energy. This is called a Follow Chart (Cong Ge β δ»ζ Ό, "Following Structure").
In a Follow Wealth chart, for example, the Day Master is so weak that it simply goes along with the Wealth energy, and Wealth becomes favourable. In a Follow Authority chart, the Day Master goes along with the controlling energy, and Authority becomes favourable.
Follow Charts are relatively rare and require very specific conditions β the Day Master must have essentially zero support: no Resource, no Friend, no root in the branches. If even one element of support exists, it's probably not a true Follow Chart and should be read as a regular weak Day Master.
Follow Charts can be extremely successful because they channel the full force of the dominant energy without resistance. But they're also fragile β if a Luck Pillar or Annual Pillar brings supportive energy that breaks the "following" pattern, it can destabilise the chart and cause problems.
A Note on Balance
It's worth saying that "strong" and "weak" aren't value judgements. A strong chart isn't better than a weak one, and vice versa. What matters is whether the chart has the right elements flowing through it to support the Day Master's strength level. A strong Day Master with good output and wealth channels can be incredibly productive. A weak Day Master with strong resource support can be deeply fulfilled. The goal isn't to be strong or weak β it's to be balanced.
Some practitioners also work with the concept of a balanced chart β one where the Day Master is neither excessively strong nor weak, and the elements are well-distributed. These charts tend to be more stable and less dramatic, but they can also lack the intensity that drives big achievements or major life events.
