《周易》六十四卦不但是「二二相耦」、「非覆即變」，而且是「二二相耦」、相反為義的。《周易》六十四卦「二二相耦」、「非覆即變」的結構形式決定了其全部三十二個卦組間兩卦的意義是相反的。《周易》六十四卦不但卦形是以「對」的形式出現的，其卦義也是以「對」的形式呈現的。「對」是《周易》的基本特點。「二二相耦」、「相反為義」這一意義結構規律的發現，有助於我們正確認識瞭解《周義》六十四卦的本義，也有助於正確認識〈雜卦傳〉和〈序卦傳〉，有助於易學史研究的深入開展。

　　　　　In the 64 hexagrams, every 2 ones are coupled, either upset or opposite. However, the coupled hexagrams are also have the opposite meanings, so do the 32 couples of hexagrams. In the 64 hexagrams, not only the bodies of the hexagrams are pairs, but also the meanings. Pairs are the basic characteristics of Zhouyi. The discovering of the rule that a pair of hexagrams have opposite meanings, will help us to understand the original meanings of the 64 hexagrams, the Xuguazhuan and the Zaguazhuan, and will help us to study the history of I-ching learning deeply.