In North Korea, Peace Movement started briskly before the Korean War. Even though the outbreak of the Korean War staged by North Korea put peace movement on hold, North Korea ran the movement anyway very actively as a propaganda in order to seek an end to the war that had become an international conflict. This article intends to clarify the developmental aspects and characteristics of North Korea’s peace movement during the Korean War period, and during the post war period of 1950s. Also analyzed here is the movement’s logic, in terms of the 1950s’ international situation. Linking the peace movement with the domestic plan for peaceful unification, North Korea used the peace movement as an advertisement agenda at home and abroad. Moreover, North Korea mobilized its citizens into a reunification project through the peace movement. After the war, primary target countries of the peace movement moved to Asia and Africa. In the late 1950s, peace movement as a mass movement slowly declined in North Korea, and promotion organizations such as the National Congress for Peace, or the Korea-Asia Solidarity Committee, acted as nongovernmental diplomatic organizations, a window to assist diplomatic activities for the government or a party.