本文主要處理《史記》與《漢書》兩部《儒林傳》中《五經》排序的不同其背後所隱藏的《易》學在中國思想史上的轉變意義。前輩學者討論此一問題大多著眼於漢代經學中的「今古文」問題。本文則從另一個角度提出一個思想史的視域，來解釋《史》《漢》二書一以《詩》居首，一以《易》領銜所可能隱含的學術問題。本文認為：《漢書．儒林傳》中的《五經》排序以《易》居首，顯示在東漢時代《易》已經取代了《詩》及《春秋》成為中國經學中影響力最大的經典。《易》學的崛起代表中國士人的注意力逐漸從政治運作上人的德行因素，轉移到對此一大規模的帝國政治社會存在的解釋及生命上的承擔。兩漢數百年的象數之學從以《易經》為首的《五經》中引發，建構了藉以解釋漢代政治社會的基於「因數以明道」觀念之下的「氣化的宇宙觀」體系。可以看出《易》學中的天人思想對秦漢以下中國帝國政治在意義解釋上的影響。最後本文又從魏晉思想中指出《易經》與《老子》的連結，建構了「理性」與「自然」這兩條思維主軸，做為中國思想史內容的基礎解釋。

This article focuses on the systematic learning meaning comes from different order of ＂Five Classics＂(五經)in ＂Classic scholars biography＂(儒林傳) of ＂History Records＂(史記)and ＂History of west Han dynasty＂(漢書). In former, ＂Book of Odes＂(詩經) lead ＂Five Classics＂ ,but in latter ＂Book of Changes＂(易經) did. ＂Book of Changes＂ headed the list of ＂Five Classics＂. It grounded on the fact that Confucius(孔子) was lift to the top standard of Saint for the political spirit of Han empire. And further, Confucius was connected with ＂The explanation book＂ to ＂Book of Changes＂(易傳). This Book, which emerged at 3 century B.C., brought metaphysical thoughts that help the philosophy founding of Han empire. And then the following dynasties preserved this idea, so ＂Book of Changes＂ became the most important classic in ＂Five Classics＂ for millennia. The systematic course of elevating of ＂book of Changes＂ at Han dynasty is my research point in this article.