This article is to research toe educational ideal and the establishing process of Gan-do Koreans\' national educational institute during Japanese invasion period and to illuminate Koreans\' potential energy. The first modern private school is Dongkwang School in Hoonchoon-hyun, Gan-do, founded in 1904. After this school the movement of establishing modern private schools was spread out vividly. After the signing of the eul-sa[을사] treaty, lots of schools were founded by many Korean patriots, working as centers to carry out anti-Japanese education. The educational ideal of the national educational institutes lie in the national mentality to elevate the patriotic independent thoughts and the modern mind. The Japanese educational policy against Korean education was to hinder the Korean national education by way of assimilation with Japan and oppression with the intention of striking anti-Japanese struggle centers. While Chinese educational policy was to oppress Koreans in Manchuria as Koreans were thought to be forerunners of Japanese invasion, they sometimes had sympathy for Koreans and tried to assimilate Koreans in order to rule over them. Nevertheless the Korean immigrants in Manchuria kept their national education, not yielding under Japanese and Chinese pressure, instilling patriotism into Koreans\' hearts, and developing into anti-Japanese movement for Korean independence.