六十四卦怎麼查？用上下卦找到卦名與卦序
作者：Wei Chun Chuang・2026-10-24
手上有六條爻，接下來要知道它是六十四卦中的哪一卦。方法不用背六十四個圖形，只要會拆成兩個三爻卦再查表。這篇說明怎麼拆、怎麼認、怎麼查，以及查到之後怎麼讀爻辭。
一個卦是兩個三爻卦疊起來的
六十四卦每一個都由兩個三爻卦（八卦）上下相疊構成。下面三爻叫下卦，也稱內卦；上面三爻叫上卦，也稱外卦。八種三爻卦任選兩個、分別放上下，八乘八剛好是六十四，這就是六十四卦的來源。
怎麼把六爻拆成兩個三爻卦？
照畫卦的順序分段就好：
- 確認六爻是從下往上排的，最底下那條是初爻。
- 初、二、三爻合起來是下卦。
- 四、五、上爻合起來是上卦。
- 先寫下「下卦是什麼、上卦是什麼」，再去查表。
注意上下不能互換。下坎上離和下離上坎是兩個不同的卦，名稱與卦辭都不一樣。
怎麼從三條爻認出是哪個三爻卦？
三條爻各有陰陽，共八種組合，由下往上記就能認出來：
- 乾：三條都是陽爻
- 坤：三條都是陰爻
- 震：下陽、中陰、上陰
- 艮：下陰、中陰、上陽
- 離：上下陽、中間陰
- 坎：上下陰、中間陽
- 兌：下陽、中陽、上陰
- 巽：下陰、中陽、上陽
熟練之後可以只記特徵：只有一條陽爻的三種是震、坎、艮（陽爻在下、中、上），只有一條陰爻的三種是巽、離、兌（陰爻在下、中、上）。
八乘八的查表怎麼用？
標準查表是一個八列八行的方格：一個方向列出八個下卦，另一個方向列出八個上卦，交會的格子就是那個卦，格子裡通常寫著卦名與卦序號碼。用法是找到自己的下卦那一條，再沿著上卦那一條找過去。查表唯一容易出錯的地方，就是把兩軸看反，所以務必先確認表格標示的是哪一軸。
卦序和查表順序差在哪裡？
通行本《易經》的六十四卦有一套固定流傳的次序，從乾、坤開始，到既濟、未濟結束，相鄰兩卦常成對出現。這套次序不是按上下卦機械排出來的，所以八乘八的表格順序和卦序號碼對不起來。引用時習慣寫成「第幾卦」加卦名，例如「第一卦 乾」或「第六十三卦 既濟」。不同版本編號大致一致，但書名、卦名譯法會有差異，引用時最好註明用的是哪個版本。
查到卦之後怎麼讀爻辭？
每一卦下面有卦辭，再加六條爻辭，依位置從下往上稱初、二、三、四、五、上。知道卦名就能翻到那一卦，再按爻位讀對應的爻辭。起卦時如果有變爻，就讀變爻那幾條；沒有變爻就只讀卦辭與象。
常見問題
- 上卦和下卦的順序會不會弄反？
- 會，而且弄反就是另一個卦。例如下卦是坎、上卦是離，和下卦是離、上卦是坎，是兩個不同的卦。查表時先確認自己看的是哪一軸。
- 卦序和查表的順序一樣嗎？
- 不一樣。通行本的六十四卦有固定的流傳次序，和八乘八查表排出來的順序不同。查表只是找卦的工具，卦序是另一套既有的編排。
- 找到卦之後怎麼讀爻辭？
- 爻辭依爻位編號，從下往上是初、二、三、四、五、上。知道哪幾爻是變爻，就照位置去讀那幾條爻辭。
想用 App 練習？
不想手動查表，易見網頁版免登入、免費，可以直接擲卦並查完整六十四卦。另外，易見是一款教你讀《易經》的 iPhone 課程 App，目前已送 App Store 審核，尚未上架。
How do you look up one of the sixty-four hexagrams?
作者：Wei Chun Chuang・2026-10-24
Once you have six lines, you need to know which of the sixty-four hexagrams they are. You do not have to memorise sixty-four figures: you split the lines into two trigrams and look them up. This article covers the split, how to identify each trigram, how to use the table, and how to find the line statements afterwards.
A hexagram is two trigrams stacked
Each of the sixty-four hexagrams is built from two three-line trigrams, one on top of the other. The bottom three lines are the lower, or inner, trigram; the top three are the upper, or outer, trigram. Eight trigrams in each position give eight times eight, which is exactly sixty-four.
How do you split six lines into two trigrams?
Just cut the stack in the order it was drawn:
- Confirm the lines run from the bottom upward, so the lowest is the first line.
- Lines one, two and three together are the lower trigram.
- Lines four, five and six together are the upper trigram.
- Write down which trigram is below and which is above before you touch the table.
The order is not interchangeable. Kan below with Li above and Li below with Kan above are two different hexagrams with different names and different texts.
How do you identify a trigram from its three lines?
Each of the three lines is yin or yang, giving eight combinations. Read them from the bottom up:
- Qian: all three yang
- Kun: all three yin
- Zhen: yang, yin, yin
- Gen: yin, yin, yang
- Li: yang, yin, yang
- Kan: yin, yang, yin
- Dui: yang, yang, yin
- Xun: yin, yang, yang
A shortcut once you are used to them: the three trigrams with a single yang line are Zhen, Kan and Gen, with that line at the bottom, middle and top; the three with a single yin line are Xun, Li and Dui, in the same order.
How do you use the 8x8 table?
The standard lookup table is a grid of eight columns and eight rows: one axis lists the eight lower trigrams, the other lists the eight upper trigrams, and the cell where they meet is the hexagram, usually printed with its name and its number. Find the band for your lower trigram, then follow it to your upper trigram. The one real pitfall is reading the axes the wrong way round, so check the labels first.
How does the received sequence differ from the table?
The received text of the I Ching arranges the sixty-four hexagrams in a fixed traditional order, usually called the King Wen sequence, beginning with Qian and Kun and ending with Ji Ji and Wei Ji, with neighbouring hexagrams often forming pairs. That order is not produced mechanically from the trigrams, so the cells of an 8x8 table do not run in numerical order. Hexagrams are normally cited as a number plus a name, for example "1 Qian" or "63 Ji Ji". The numbering is broadly consistent across editions, but names and translations differ, so it helps to say which edition you are using.
Finding the line statements
Each hexagram has a statement for the hexagram as a whole plus six line statements, numbered by position from the bottom up: first, second, third, fourth, fifth and top. Once you know the hexagram's name you can turn to it and read the statement for any position. If your casting produced changing lines, read those positions; if it produced none, read the hexagram text and its image alone.
常見問題
- Can I mix up the upper and lower trigram?
- Yes, and swapping them gives a different hexagram. Kan below with Li above is not the same hexagram as Li below with Kan above. Check which axis of the table you are reading.
- Is the hexagram number the same as the table order?
- No. The received text has its own fixed sequence of the sixty-four hexagrams, which differs from the order an 8x8 table produces. The table is a finding aid; the sequence is a separate traditional arrangement.
- How do I read the line statements once I have the hexagram?
- Line statements are numbered by position, from the bottom upward: first, second, third, fourth, fifth and top. Once you know which lines are changing, read the statements for those positions.
Practise with an app
If you would rather not work through a table by hand, the YiJian web version is free and needs no login: it casts hexagrams and holds all 64 of them. YiJian is an iPhone course app that teaches you to read the I Ching; it is currently in App Store review and not yet released.