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This study is the recognition and correspondence policy about Japan by Ryu, Sung-Ryong.before Imjinwaeran. The Japanese invasion of Choson in 1592 Between Choson and Japan exist in tension. at that time Ryu thinks Japan is barbaric and crafty tribes with warlike. at then Japan has good weapons, for example Jo-Chong, sword and spears. in those days Daemado plays a role of mediation in two nations. Japan always assist Daemado in case of diplomatic problems with Choson. Ryu thinks Choson must repulse Japan's invasion by force. but he thinks sometime needs compromise for people's stability. Ryu divised correspondence plans for Japan. It is as following. First, he insists political leaders must gain the minds of peoples. in that case peoples love his country and leaders with preparedness for death. Second, he recommended competent general to defend for Japanese attack. such as Lee, soon-sin, Kwon, yul, Jo, ho-ik, Sin, chung-won etc. Third, he requires strict army order, and set up San-Sung(mountain fortress),because at that times Japanese army is very skillful in level land battle. Fourth, he prepared crack troops by well training for Japanese army.