Relations between Song Dynasty and Vietnam are not only one of the most important external relations of Song Dynasty but also a major stage of the whole history of the ancient China-Vietnam relations. Throughout the period of both Northern and Southern Song Dynasties, there were frequent and colorful official contacts between the Song Dynasty and both the Jiaozhi Government in the North and the Champa Kingdom in the South of Vietnam, which formed both the major expression of the friendly relations between them and the foundation of the economic and cultural exchanges.The dissertation consists of six chapters. Chapter I is Peripheral Situation of the Song Dynasty and Corresponding Policies, stating briefly the Song Dynasty's surrounding situations and her corresponding external policies. Chapter II is Relations between the Song Dynasty and Jiaozhi (I), observing the diplomatic relations between the Song and both the Dings'and the Lis'dynasties as well as the essential reasons of the war between the Song and the Li Dynasties. Chapter III, Relations between the Song Dynasty and Jiaozhi (II), focuses on the relations between the Song Dynasty and the Li Dynasty founded by Li Gongyun, the formation of China-Vietnam border, the Nong Zhigao Uprising and the trilateral diplomatic relations among the Song, the Yuan and the Vietnam. In Chapter TV, the Champa Kingdom in the Relations between the Song and the Jiaozhi government, discussions are made on the diplomatic contacts between the Song Dynasty and the Champa Kingdom, and the bilateral relationship among the Song Dynasty, the Jiaozhi and the Champa Kingdom. Chapter V, Economic and Cultural Exchanges between the Song Dynasty and Vietnam, concentrates on the study of the economic contacts, cultural exchanges and mutual migrations between them. Chapter VI, the Conclusion, serves as a sum-up of the essential features of the Song-Vietnam Suzerain-Feudatory relationship. Also, some personal observations are given on the major elements undermining the relations between the two countries.