天地定位，山泽通气，雷风相薄，水火不相射，八卦相错。
Heaven and Earth determine the positions. Mountain and Lake share their influences. Thunder and Wind arouse each other. Water and Fire do not combat each other. The eight trigrams intermingle.
学习引导
Learning Guide
八卦是易经的基础符号系统，由三爻（阴爻⚋或阳爻⚊）组成。建议先记忆每卦的基本象征（自然物象、家庭成员）， 再学习五行属性和方位对应，最后理解先后天八卦的不同排列。
The eight trigrams are the fundamental symbol system of the I Ching, each composed of three lines (yin ⚋ or yang ⚊). Start by memorizing basic symbols, then learn element correspondences, and finally understand Early/Later Heaven arrangements.
八卦一览
Click any trigram card to explore its detailed attributes
☰
乾
Heaven / The Creative
天 · Heaven
五行metal
方位西北
家庭父
身体首
☷
坤
Earth / The Receptive
地 · Earth
五行earth
方位西南
家庭母
身体腹
☳
震
Thunder / The Arousing
雷 · Thunder
五行wood
方位东
家庭长男
身体足
☴
巽
Wind / The Gentle
风/木 · Wind/Wood
五行wood
方位东南
家庭长女
身体股
☵
坎
Water / The Abysmal
水 · Water
五行water
方位北
家庭中男
身体耳
☲
离
Fire / The Clinging
火 · Fire
五行fire
方位南
家庭中女
身体目
☶
艮
Mountain / Keeping Still
山 · Mountain
五行earth
方位东北
家庭少男
身体手
☱
兑
Lake / The Joyous
泽 · Lake/Marsh
五行metal
方位西
家庭少女
身体口
先天八卦与后天八卦
先天八卦
伏羲先天八卦
乾 S
兑
巽
离
坎
震
艮
坤 N
先天八卦代表原始宇宙秩序，对卦互补：天地、火水、雷风、山泽。
后天八卦
文王后天八卦
离 S
巽
坤
震
兑
艮
乾
坎 N
后天八卦代表显化世界，与五行和四季方位的自然循环对应。
八卦属性一览
| 八卦 | 五行 | 方位 | 季节 | 家庭 | 动物 |
|---|---|---|---|---|---|
| ☰乾 | metal | Northwest | Late Autumn | Father | Horse |
| ☷坤 | earth | Southwest | Late Summer | Mother | Cow |
| ☳震 | wood | East | Spring | Eldest Son | Dragon |
| ☴巽 | wood | Southeast | Late Spring | Eldest Daughter | Rooster |
| ☵坎 | water | North | Winter | Middle Son | Pig |
| ☲离 | fire | South | Summer | Middle Daughter | Pheasant |
| ☶艮 | earth | Northeast | Late Winter | Youngest Son | Dog |
| ☱兑 | metal | West | Autumn | Youngest Daughter | Sheep |
乾，天也，故称乎父。坤，地也，故称乎母。震一索而得男，故谓之长男。巽一索而得女，故谓之长女。
Qian is Heaven, hence called Father. Kun is Earth, hence called Mother. Zhen, by a single line seeking, obtained male, hence called eldest son. Xun, by a single line seeking, obtained female, hence called eldest daughter.
八卦的形成
"易有太极，是生两仪，两仪生四象，四象生八卦"
易有太极，太极生两仪，两仪生四象，四象生八卦。
太极 Taiji
☯
两仪 Liangyi
⚊ 阳 ⚋ 阴
四象 Sixiang
太阳、少阴、少阳、太阴
八卦 Bagua
☰ ☱ ☲ ☳ ☴ ☵ ☶ ☷