This article is to study on the Self-Reliant Defense Policy of the ROK in the 1970s. In this article, I divided the Self-Reliant Defense Policy of the ROK in the 1970s into the groping, development and deepening periods, and appraised the evolution and peculiarity. Groping Period(1968~1970) was the term that prepared the Self-Reliant Defense capability centering around the Self-Reliant Defense willing. In this period, the ROK actively evaluated national security meeting and formed strategic sympathy of the national leaders. Development Period(1971~1975) was the term that strengthened the Self-Reliant Defense willing through all-out national security and prepared the Self-Reliant Defense capability through the Yul Gok projects. Also the ROK tried to produced arms, tanks, combat ships by oneself and developed missile, nuclear weapon to guarantee war deterrence. Deepening Period(1976~1979) was the term that the Self-Reliant Defense Policy of the ROK was actively leaded. In this period, the ROK established the Fighting Power Reinforcement Research Committee to found long term plan to develop fighting power reinforcement. And the ROK made establishment systems of self reliant military strategy. Through this research, I confirmed that the ROK had tried to set up the Self-Reliant Defense posture for about 10 years. Specially in 1970s the latter half, the ROK had tried to prepared military strategy and strategic weapons to cope with not only the North Korea's threat but also neighboring countries' threat. Also I was able to confirm importance of national leader group's security sympathy and the people's support. In conclusion, through this research I drew implication that national leader group, the people's sympathy is important to ensure national security.