The purpose of this thesis is to study Thailand's foreign relations. The specific argument will be that, to a large extent, Thailand was able to keep her independence because of her rulers' ability to adapt the country's policy to the changing circumstances in foreign affairs. Therefore, it was imperative for policymakers to look at the threats to the country's security from the local point of view and to develop appropriate policies for dealing with them accordingly. The thesis is organized into six chapters. After the introductory chapter, the second and third chapters examine the historical development and the general features of the foreign relations of Thailand, respectively. Chapter Four deals with the change in the direction of foreign policy after the Second World War. In contrast to the traditional foreign policy, the government under military dictatorship gradually moved in the direction of the Western, especially American, position. The positive and negative consequences of the pro-American policy are treated in Chapter Five, It is pointed out that this policy contributed to the sharp increase in activity of Communist insurgents in various parts of the country. By comparing the post-war foreign policy with the traditional policy prior to that time, a conclusion can be drawn that Thailand is better off with her traditional method in dealing with foreign powers, That is, under normal circumstances she should maintain friendly relations with other countries but should not become too closely involved and identified with any foreign power in particular.