After World War II, Japan is taking a road of Pacifism in one country. In the early postwar period, under the leadership of Prime Minister Yoshida Shigeru,Japan is to implement a policy of heavy economy, light armaments, and relying heavily on Japan-US alliance. Therefore, Japan's security mainly rely on the Japan-US security treaty and its limited and gradually developed self-defense force of the two pillars. However, with the end of the cold war, the international environment has undergone profound changes. The Gulf War became the origin of the adjustment of Japan 's security outlook after the Cold War. In the Gulf War, although Japan provided huge amounts of money for the multinational force, it was still Subjected to criticism from the international community, especially its allies, the United states. This kind of experience has caused great trauma to Japan's diplomacy. As a turning point, In Japan, there has been a debate about the existence of postwar pacifism in Japan, reflecting on its long-standing security concept. In such a public opinion environment, the Japanese government has begun to adjust its security concept and security policy.
Key Words: Gulf War;Japan's Security Concept;International Contribution;Japanese Self Defense Force