This book conducts detailed research and analysis on the relevant literature and historical evidence regarding the 640-year history of ancient and modern China and other countries since the Ming Dynasty, and clarifies the chain of evidence concerning the Diaoyu Islands in terms of the facts and jurisprudence. Divided into seven chapters, the book includes over 220 original documents and maps. From the perspective of international law and historical fact, the author clarifies common misconceptions and refutes the opinions on the Diaoyu Islands issue put forward by Japanese officials and some scholars in recent years. By examining the historical documents and related maps of China, Europe and the United States, the ancient Ryukyu Kingdom, and Japan, the book presents convincing arguments that the Diaoyu Islands are historically Chinese territory, as one of the affiliated island groups of Taiwan. The book will be of considerable interest to scholars of Chinese foreign policy, Asianpolitics, security studies and international relations.