中文摘要：

最近,钓鱼岛和南中国海争端已经成为我国面临的重大国际挑战,通过历史证据和他国的一些文件、地图等资料论证他国对我国在钓鱼岛和南海诸岛的承认在国际法上的意义,并对相关国家以现代海洋法作为主权要求根据的局限性予以分析,结合时际法原则总结出南海诸群岛、钓鱼岛的主权归属问题。有关国家对南沙群岛、钓鱼岛的主权要求不仅缺乏历史根据,而且在国际法上也站不着脚;它们对南沙群岛、钓鱼岛的侵占活动是非法的、无效的行为。

英文摘要：

Recently the disputes over Diaoyu Island and South China Sea Island pose great international challenge to China. This paper starts from the analysis of China ＇s ＂ discovery＂, ＂ preoccupation＂ by means of historic evidence and other documents gathered from other countries and their significance in international law.Then it analyzes the limitations of contemporary ocean law based on which some relevant countries seek sovereignty. In addition,it discusses the ownership of South China Sea Island and Diaoyu Island by using the principles prescribed in inter-temporal law. At last this paper concludes that the relevant countries＇ request for the sovereignty of Nansha Island and Diaoyu Island lacks of historic evidence and can not hold water in international law and their invading activities are illegal and invalid.