This study aims to describe the history of Korean education as a foreign language(KFL) during the Japanese Imperialism. I focused on the language policy of encouragement for Korean. During the Japanese imperialism, language polices were generalization of Japanese, restraint of Korean and teaching Korean for Japanese government officials. The policy of teaching Korean for government officials established by the need of practical communicative problems. This policy was called 'encouragement for Korean', so many researchers was mistaken in thinking that the imperial government practiced Korean education for Joseon peoples. But this policy was Korean education as a second language for Japanese. This paper focused on the primary factor and trends of this language policy. The primary factor was communicative problems for dominate needs. So they were set up the test so called 'Joseon-eo Jangryeo Siheom'(1922). In 1938, the name alternated 'Joseon-eo Siheom(test of Korean)'. But this policy influenced on KFL that Korean researchers established '(Gyeongseong)Josen-eo Yeonguhoi(research circle for Korean education)' and published many textbooks. The magazine of monthly Joseon-eo was famous for preparing the examination. In this times, the textbook specialized pronunciation-letters, grammar and speech.