Ancient territory has an important influence on modern territorial sovereignty, but it cannot be simply said that ancient territory directly determines modern territorial sovereignty. On the one hand, ancient territory is an important historical basis and source of modern territorial sovereignty. The territorial scope formed by a country or region in the long-term historical development process reflects its historical context and development continuity to a certain extent, and has an important historical basis for the modern territorial sovereignty claim. On the other hand, modern territorial sovereignty is determined by a series of international law principles, international relations norms, historical development and evolution, national self-determination and other factors. The territorial scope of modern sovereign states is gradually clarified and stabilized through the recognition of the international community, the definition of international treaties, and peaceful negotiations and consultations while inheriting historical heritage. It is not simply determined by the ancient territory. For example, some countries have experienced complex processes such as territorial changes, mergers, and divisions in their historical development. Modern territorial sovereignty is the result of comprehensive consideration of various factors. In short, ancient territory is an important factor, but modern territorial sovereignty is a complex concept formed by the interweaving of multiple factors. It cannot be simply equated or determined that ancient territory directly determines modern territorial sovereignty.