《孟子正义》是清代乾嘉学者焦循晚年的学术名著，自它公开出版以来，深受儒学特别是孟子研究者的重视和关注。本文则从易学的角度，考察、发掘焦循阐述《孟子》思想的易学内涵，认为孟子崇尚的所谓先王之道，是以易学中的通神变化之道，即“时”的观念作为其思想基础的，并藉此对孟子的经权思想作了易学的发挥，指出其具有调适和顺化先王之道的双重特征。焦循认为孟子的性善论也烙有易学“感而遂通之性’伪印痕，但在论证过程中，焦循却摒弃孟子的性善说，成为告子人性论的维护者。至于重塑孟子的理想人格，焦循终究未能翻出儒家在现世社会生活的背景下，以道德实践为根本内容来构建理想人格的旧轨。 The ”Mencius Justice“ is an academic masterpiece of late years of Jiao Xun, a scholar of the Qianghui era. Since its publication, it has received great attention and attention from Confucianism, especially Mencius researchers. This article, from the perspective of I Ching learning, explores and explores Jiao Xun’s intension of explicating the Yi-ology of ”Mencius“ thought. He believes that the so-called prequel to Mencius advocated by Mencius is based on the idea of ​​”changing time“ Based on which Mencius’s idea of ​​the right to power made an easy to learn play, pointed out that it has the dual characteristics of adaptation and Hue king. Jiao Xun holds that Mencius’s theory of good nature is also branded with the false impression of ”easy feeling", but in the process of argument, Jiao Xun abandoned Mencius’s good nature and became the maintainer of the theory of human nature of proclamation. In the background of the social life in the world, Jiao has failed to turn the old track of constructing ideal personality with moral practice as the basic content.