In BaZi, your Four Pillars are made of four pairs of Chinese characters — one for Year, Month, Day, and Hour. The top character of the Day Pillar is called the Day Master (日主), and it is the single most important element in your entire chart. 在八字命理中，你的四柱由四对汉字组成——分别对应年、月、日、时。日柱的天干称为日主（日主），是整个命盘中最重要的一个元素。
Why the Day Master Matters为什么日主如此重要
Think of the Day Master as your core personality and elemental identity. Every other pillar in your chart is interpreted in relationship to it. If your Day Master is Yang Wood (甲), then Water in your chart is supportive, while Metal creates friction. 把日主想象成你的核心性格和五行身份。命盘中的其他所有柱，都是相对于日主来解读的。例如，如果你的日主是甲木（阳木），那么命盘中的水对你是滋养支持的，而金则会带来压力和阻力。
Knowing your Day Master allows you to immediately understand which elements help you and which create friction — in career, relationships, health and finances. 了解你的日主，让你立即明白哪些五行元素对你有益、哪些带来阻力——这适用于事业、感情、健康和财运各个方面。
The Day Master is not who you want to be — it is who you already are at your deepest level. Working with it rather than against it is the foundation of living in harmony with your chart. 日主不是你想成为的人——而是你在最深层面已然是的那个人。顺应日主而非逆其而为，是与命盘和谐共处的根基。
The 10 Day Masters at a Glance十天干日主速览
There are 10 Heavenly Stems (天干), each corresponding to one of the Five Elements in Yang or Yin form. Your Day Master is determined by your exact birth date. 十个天干，每一个对应五行中某一行的阴或阳形态。你的日主由你的精确出生日期决定。
| Stem天干 | Element五行 | Nature象征 | Key Traits核心特质 |
|---|---|---|---|
| 甲 (Jiǎ) | Yang Wood阳木 | The Towering Tree参天大树 | Ambitious, principled, strong-willed志向远大、原则性强、意志坚定 |
| 乙 (Yǐ) | Yin Wood阴木 | The Graceful Vine柔韧藤蔓 | Flexible, creative, persistent灵活、富有创造力、锲而不舍 |
| 丙 (Bǐng) | Yang Fire阳火 | The Brilliant Sun灿烂太阳 | Charismatic, generous, idealistic极具魅力、慷慨大方、理想主义 |
| 丁 (Dīng) | Yin Fire阴火 | The Steady Candle温柔烛光 | Warm, intuitive, devoted温暖、直觉敏锐、忠诚专一 |
| 戊 (Wù) | Yang Earth阳土 | The Mountain巍峨山岳 | Reliable, patient, steadfast可靠、耐心、坚定不移 |
| 己 (Jǐ) | Yin Earth阴土 | The Fertile Field肥沃田野 | Nurturing, practical, caring滋养他人、务实、充满关怀 |
| 庚 (Gēng) | Yang Metal阳金 | The Sharp Sword锋利宝剑 | Decisive, righteous, direct果断、正直、直来直往 |
| 辛 (Xīn) | Yin Metal阴金 | The Polished Jewel精美珠宝 | Refined, perceptive, meticulous精炼、敏锐、注重细节 |
| 壬 (Rén) | Yang Water阳水 | The Ocean浩瀚大海 | Visionary, adventurous, resourceful有远见、勇于探索、随机应变 |
| 癸 (Guǐ) | Yin Water阴水 | The Gentle Rain润物细雨 | Thoughtful, empathetic, wise体贴、富有同理心、智慧内敛 |
How to Find Your Day Master如何找到你的日主
The Day Master is calculated from your exact birth date using the traditional Chinese calendar. Even one day's difference can completely change your Day Master. 日主通过你的精确出生日期，按照中国传统历法计算得出。哪怕只差一天，日主也可能完全不同。
Find Your Day Master — Free免费查询你的日主
Enter your birth date for an instant Four Pillars chart with your Day Master highlighted.输入出生日期，立即获得四柱命盘，日主一目了然。
✦ Calculate My BaZi Chart✦ 测算我的八字命盘