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. 군 사 사 / 기 타 군사연구 제128집 261 Characteristics of Kyung-ki Province and Pyuong-ahn Provinces’ national defense in the beginning of 17th century Cap. Sung-jin, Jang ROK Army KCTC The purpose of this paper is to examine the military concepts of Chosun dynasty and how they prepared for war through the major battlefields during the 17th century. Author argues that the military experts during the Chosun dynasty fully recognized the importance of geography played in the national defense system. With these concepts in mind, Chosun dynasty established various defense systems along the Pyuong-ahn and Kyung-ki province that are still pertinent to modern world's national defense system.