Yao Pei-Zhong was a Yi-ologist in the Jiaqing and Daoguang periods of the Qing Dynasty. After Hui Dong, and Zhang Hui-Yan, he interpreted the Yi learning of the Han Dynasty. In addition to inheriting the Yi-ology of Hui Dong, and Zhang Hui-Yan, he set up based on the Yi learning of the Han, Wei, and Tang Dynasties the theoretical structure for the essence of Yi and became a master. Most of the scholars in the late Qing Dynasty and the early Republic of China praised Yao Pei-Zhong. Yao's Yi-learning is worth exploration. However, it is a pity that Yao's Yi learning is not valued by today's academia. In the late Qing Dynasty, Zhang Shou-Rong selected the first three articles from Zhouyi Yao Shi Xue, which were about the general theory of Yi-ology, and printed them as a separate book, Yi Xue Chan Yuan, representative of the extracted Yi-ology thoughts of Yao Pei-Zhong. In the current study, Yi Xue Chan Yuan was researched as a path to Yao's thoughts. The contents of Yi Xue Chan Yuan, the characteristics of Yi Xue Chan Yuan in interpreting Zhouyi, and the inheriting and developing of Yi Xue Chan Yuan for Yao's essence-of-Yi theory were illustrated in this study. It was hoped that the depth of Yao's Yi-ology could be looked into slightly through this study.