Abstract: LU Jiu-yuan interprets Yi by his heart-mind theory to seek classical basis for the establishment and opening up of his heart-mind theoretical system. Aspects of ontology, moral cultivation training and realm of thought embraced in his heart-mind theory are closely related to his views on Zhouyi. His wisdom reflected in the heart-mind theory also enriched the cultural treasure of the Yi learning.
Key words: LU Jiu-yuan; heart-mind theory; Zhouyi; simplicity of Yi