Studying the process of exploiting and protecting Vietnam's sovereignty over islands and islands, especially Hoang Sa and Truong Sa in history, can realize that: The Paracel Islands are always the object of management, exploitation and protection of the provinces: Quang Ngai, Thua Thien Hue, Quang Nam and Da Nang city. The ancient Vietnamese as well as Vietnamese authorities in history have relied on these specific geographic, economic and political conditions to make such provisions. To make this book, the authors have carefully selected, collected and edited national and international scientific papers recently; scientific articles published in prestigious magazines nationwide; especially those collected at the French National Archives Overseas Center (Archives nationales d’Outre-mer, ANOM); and the recollections of witnesses who lived and worked in the Paracel Islands through historical periods ...