Zi Wei Dou Shu (紫微斗数 zǐ wēi dǒu shù), Purple Star Astrology, is one of the two great birth-chart systems of Chinese metaphysics — the other being Ba Zi (八字 bāzì). Where Ba Zi reads a life through five elements and their balance, Zi Wei Dou Shu maps it onto a grid of twelve palaces, each populated by “stars” led by 紫微, the Emperor or Pole Star. It is prized for detail: it reads specific domains of life — marriage, wealth, career, health — palace by palace.
This guide is the way in. It explains what Zi Wei Dou Shu is, how the twelve palaces and fourteen major stars build a chart, how the four transformations bring it to life, and how it reads alongside Ba Zi. Each section links to a fuller article.
What Zi Wei Dou Shu Is
Named for its chief star, Zi Wei Dou Shu has been read for centuries as a map of character and circumstance. A chart is computed from your lunar birth date and hour, which fix where the Emperor star sits; the other stars then follow in fixed positions around the twelve houses. Read the full introduction in what is Zi Wei Dou Shu, and meet its central star in the Zi Wei star, the Emperor of the chart.
紫微斗数 · Purple Star
See your own chart. Plot your twelve palaces and their stars free — from your birth date and time, in your browser.
>The Twelve Palaces
The frame of the chart is twelve palaces (十二宫 shí èr gōng): Life, Siblings, Spouse, Children, Wealth, Health, Travel, Friends, Career, Property, Wellbeing, and Parents. The Life palace (命宫 mìng gōng) anchors everything; each other palace governs one domain of life. Learn them in the twelve palaces of Zi Wei Dou Shu.
The Fourteen Major Stars
Fourteen major stars (十四主星 shí sì zhǔ xīng) fall across the palaces, each with a distinct character — from 紫微 the Emperor and 天府 the Treasury to 七杀 the General and 破军 the Vanguard. Their placements, read together with a host of minor stars, give the chart its texture. See the fourteen major stars.
Major Stars and Minor Stars
Not every star carries the same weight. The fourteen majors set the tone of a palace — its ambition, its temperament, its central concern — but they never sit alone. Around them fall the minor or auxiliary stars, which colour and qualify what the majors suggest. Practitioners gather the most important minors into two sets. The six auspicious stars (六吉 liù jí) lend a palace strength: 左辅 (zuǒ fǔ) and 右弼 (yòu bì) for support, 文昌 (wén chāng) and 文曲 (wén qū) for scholarship, 天魁 (tiān kuí) and 天钺 (tiān yuè) for mentors and helpful people. The six inauspicious stars (六煞 liù shà) introduce strain: 擎羊 (qíng yáng) and 陀罗 (tuó luó) for friction, 火星 (huǒ xīng) and 铃星 (líng xīng) for sudden force, 地空 (dì kōng) and 地劫 (dì jié) for loss and emptiness. A wealth store such as 禄存 (lù cún) can steady a palace; a friction star can unsettle an otherwise strong one. Reading well means holding majors and minors together, weighing how they modify each other, rather than tallying good stars against bad. The label is a starting point, not a verdict.
The Four Transformations
What makes a Zi Wei chart move is the four transformations (四化 sì huà) — resource, power, reputation, and obstacle — set by your birth-year stem and, in the Flying Star school, read as energies passing between palaces. This is the dynamic heart of a reading; see the four transformations. To put it all together, how to read a Zi Wei Dou Shu chart walks through the method.
The Four Transformations in Practice
The four transformations are what turn a static grid into a living reading. Your birth-year stem assigns each of four major stars a transformation, by a fixed table rather than by choice: 化禄 (huà lù) brings resource and smoothness, 化权 (huà quán) brings power and authority, 化科 (huà kē) brings reputation and recognition, and 化忌 (huà jì) brings obstacle and fixation. In the Flying Star school (飞星派 fēi xīng pài), these are read as energies that fly from one palace to another. A 化禄 landing in the Career palace (官禄宫 guānlù gōng) reads as fortune flowing toward work; a 化忌 falling in the Spouse palace marks a knot in marriage to be understood and untied. The 化忌 is not a sentence of doom. It points to where attention sticks, where effort meets resistance, and often where the real growth of a life is found. The Trinity school (三合派 sān hé pài) leans instead on star combinations read across trines of palaces. Both approaches work from the same fixed chart; they differ in emphasis, not in the facts on the grid.
Reading a Single Palace
Most questions in Zi Wei Dou Shu are answered one palace at a time, and there is a steady order to it. Take the Wealth palace (财帛宫 cáibó gōng). You look first at which major star sits there and what it wants — 武曲 (wǔqū), the star of resolve and money, reads very differently from 天同 (tiāntóng), the star of contentment and ease. Then you read the minor stars sharing the palace, the transformations touching it, and, in the Trinity reading, the palaces it forms a triangle with. A palace is never judged in isolation: its opposite palace across the grid and its trine partners lend the context that settles a meaning. This is why the same star says one thing in the Life palace (命宫 mìng gōng) and another in the Spouse palace (夫妻宫 fūqī gōng) — the domain shapes the reading. The chart is deterministic, fixed the moment it is plotted; the work is not to compute it but to interpret it with patience, palace by palace. The method is set out in full in how to read a Zi Wei Dou Shu chart, and the frame of all twelve houses is in the twelve palaces.
Plotting a Chart
A Zi Wei chart needs an accurate birth time, since the hour helps fix the Life palace. What a calculator does — and why precision matters — is explained in the Zi Wei Dou Shu calculator guide. Our own Purple Star tool is in development; in the meantime you can plot your Ba Zi chart free and read it in full — with luck pillars and a written reading — in the Butcher Boy app.
Zi Wei Dou Shu and Ba Zi
The two systems are complementary, not competing. Ba Zi reads elemental balance and timing; Zi Wei reads life domain by domain in fine detail. Many practitioners consult both — Ba Zi to know the person, Zi Wei to examine a particular corner of life. We compare them in Zi Wei Dou Shu vs Ba Zi. In Singapore, a Butcher Boy reading can weigh both together — see Zi Wei Dou Shu in Singapore.
Where to Begin
If you are new, read what Zi Wei Dou Shu is, then learn the twelve palaces — the frame every reading hangs on. And because the two great charts are strongest together, start with your own Ba Zi: plot it free with the calculator, and when a decision carries weight, a personal reading can weigh both systems for you. Cut through fate, palace by palace.