The School of the idealism of the Neo Confucianism had been considered as emphasizing more on the actualization of moral mind than on the mere studying of books. As a result their teachings on classics were more freely and flexible. On the other hand, the scholars of Chu Hsi' school could grasp the original meaning of the classics. Nevertheless the interpretation of the classics from the idealists through their realization and experiencing of moral mind actually giving us more satisfaction which is really beyond our expectation, yet their interpretation is still accurate. Futhermore, Lu Hsiang-shan, Luo Chin-hsi, Chou Hai-mun are mentioned in this essay to verify my concepts.