《易筌》乃晚明焦竑解《易》論《易》之代表作。從〈《伏羲圖贊》序〉、〈《易纂言》序〉、〈答樂禮部〉、〈答鄧孺孝〉、〈刻《蘇長公集》序〉諸文的討論中，可以得知他深諳《易》理及其演變，透過《易筌》能見其博採衆說以詮解《易》之方式，有引先秦諸子之言以解《易》、引儒者之言以解《易》、引《說文》以解《易》、引經史之言以解《易》；《易筌》後之〈附論〉中論《易》經傳之分合、重卦之人、論〈繫辭傳〉之「大衍之數」、論河圖、洛書之數等論及幾個易學觀點，皆是本文研究之重點。

《YI CHAN》was representative works by Jiao Hong to discuss 《YI》. He wrote 〈Foreword《Fu Si To Zan》〉, 〈Foreword《YI JUAN YEN》〉, 〈DA YE LI BU〉, 〈DA DAN ZU SHUO〉..etc. He was《YI》expert that fully appreciate the principle and develop in《YI》. In《YI CHAN》,he use a lot of ways to explain《YI》. For example：He quote early Qin dynasty expert's theory to explain《YI》. Confucian's theory to explain《YI》. 《SO WEN》to explain《YI》.Quote scripture and historiography to explain 《YI》.That is the important part to research in this paper.