本文以研究近期（2009－2014）國際海域劃界的裁決為中心，說明其對南海劃界可能的啟示。在近期海域劃界中，本文以為衡平劃界架構的三段論化、比例原則功能的擴張、部分島嶼劃界效力的逐漸明確化、超過兩百海里劃界越趨重要與默示海域劃界協議等，都是相當重要的劃界法理發展。在討論近期海域劃界的重要發展後，將進一步說明其對南海周邊各聲索國之海域劃界主張的啟示。本文發現，兩岸政府所主張的 U 形線，不管是作為歷史性權利、水域或海域劃界主張，從現階段的證據來說似乎較難通過衡平劃界架構的檢驗。而其他各國主張南海所有海洋地物都無法產生專屬經濟海域和大陸礁層的主張，似乎也和國際司法實踐不合。

This article analyzes the recent development of maritime delimitation jurisprudence of various judgments of international judiciary between 2009 and 2014 along with their possible impacts on the South China Sea. The author argues that the development of three-stage approach to equitable maritime delimitation, the expansion of the function of proportionality, gradual coherence of the island effect, delimitation beyond 200 nautical miles and implicit maritime delimitation agreement are the most important developments in the recent years. After analyzing those developments, the author further discuss their possible impacts on different maritime claims made by the claimants of South China Sea. The author argues that the U-shaped line implicitly claimed by either Taiwan or China, may not be easily justified under the equitable maritime delimitation framework, no matter the line stands for historical rights, historical waters or maritime delimitation claims, which may need further solid evidence to justify. For other littoral states claim that no maritime feature in South China Sea can generate exclusive economic zone and continental shelf is not consistent with the practice of international judiciary either.