This report try to search Japan's accomodation of Toegye study and meeting of Toegye and Japan. Also try to consider a source that is respected by sholars of Edo period, intellectual of Chosun period and the king who was most powerful at that time. As we know Toegye concentrated on study even his father's death. He become a goverment official when he was 34 year's old, but he keep devoted oneself to study. That make him become a great moralist and contributed to the development of Chosun's Neo-Confucianism. He like to devote himself on the research more than political affairs as goverment official. Therefore, he return to his hometown and establish the Dosan seowon(陶山書院) for educating younger scholars. He showed not only features of teacher as inheriting of knowledge to student but also individuality that is enough to inspire other people. As result, a lot of powerful politicans and scholars like Yoo Sung Ryong(柳成龍, 1542～1593), Kim Sung Ill(金誠一, 1538～1593), Jung Gu (鄭逑, 1543～1620) and Jo Moc(趙穆, 1524～1606)were appeared under his great education. Toegye's philosophy that contains his moral, attitude and life was highly evaluated by many moralists and politicans. Toegye concentrated on study for people's moral reform and education of younger scholars not the successful career or fame. His humanity and famous of researchs become respectful object even by the whole nation.