As having been considered in this study, the Joseon dynasty definitely aimed at realizing the ideal Confucian dynasty, which was presumed by Jeong Do-jeon, while faithfully learning 『Daehakyeonui (大學衍義)』in the period of national foundation, namely, a nation without a worry about Wimangbokchu(危亡覆墜) with enjoying Janghyanganbujonyeong(長享安富尊栄), by which the gracious king governs so that people in the world can look up as if being their parents. Its spirit of the national foundation had been succeeded loyally by competent Confucian scholars such as Gwon Geun, Lee Hoe-jae and others. However, the appearance of Lee Toe-gye is thought to have become a turning point of drawing the Confucian Min-bon Thought, which had been the spirit of the national foundation, closer to people, of making the Learning for the Ruler(帝王學) a commoner, and simultaneously of suggesting just Confucianism even to common people as the important teaching. On the contrary to that, it was difficult to understand the natural attitude of this Joseon Confucianism in Japanese Dokugawa Makbu(德川幕府), which has no even contest system of the state examination. It was same even in Confucian scholars for the school of Chu-Tzu theory(朱子學派) such as Hayasi Rajan(林羅山) and Yamajaki Ansai(山崎闇齊). When thinking relationship between ruler and Confucianism in the Joseon Dynasty and the Edo Shogunate(江戶幕 府), this difference in the Learning for the Ruler(帝王學), and the characteristic in Joseon Confucianism, which made Lee Toe-gye's innovative doctrines of Confucianism, are considered to be important theme that will need to be continuously thought after this.