卦變的思想雖源自於荀爽，而真正的卦變體例應始自虞翻，再由姚信、蜀才逐漸開展，然後才有後世各種卦變理論的產生。然因這時期的《易》 注常因亡佚不全而導致研究不易，故筆者逐一考辨清人對魏晉諸家所輯佚的卦變條文，審察其對錯曲直，藉此說明魏晉時期卦變易例的發展脈絡，並證明虞翻、姚信、蜀才等人的卦變學說具有「一爻動，二爻交易」、 「某卦本於某卦」的理則，對於後人主張「推卦之所由來」、 「某卦從某卦變來」的卦變理論確實產生啟發作用。本文內容大約有四個要點：(一)界定「卦變」涵義，推閘易家所謂的「推卦之所由來」、「某卦從某卦變來j 的理論，並證明這是魏營卦變說的理論基礎。 (二)清楚闡述虞翻卦變說的發展狀況及其變例、違例之處。(三)找出姚信、蜀才對虞翻卦變說的補正，同時也表迷自己與學者不同之見。(四)最後總結並還原魏晉卦變說的真實面貌。 本文擬從這幾個要點來作探析。 GUA-BEIN (卦變) is one of the most important issue of Yi-ology ' S history in the Wei Jin period , and there are various theories developed in the following dynasties .In this essay, the author considers that GUA-BEIN (卦變) should be defined , and in this way can it becomes the distinction of " the symbol of Yi -ology”The author believes that although the original advocator of GUA-BEIN (卦變) is Xun -Shang the real regulation so of GUA-BEIN (卦變) originated form Yu-Fan . In the later development , Yao-Shin and Shu-Cai began to make advanced progress of it , and after that , there are theories about it brought up The theme of this essay included for important Propositions -First , the author gives GUA-BEIN (卦變) a clear definition in order to deduce the progress of the development between the previous and now Gua symbols . Second , the author clearly explains the development of GUA -BEIN (卦變)and their later variations which break the original rules . Third , the author brings YAO-HSIN and SHU- TSAI ' s corrections to Yu-Fan ' s theory , and in the meantime , the author also brings up her distinctive views of them . Lastly , the author sum up the whole essay and reverts the study of GUA-BEIN (卦變) in Wei Jin Period to its original state .