"Four seas measurement" in the Yuan dynasty is the latitude surveying in ancient China, namely astronomical surveying or astronomical geodetic surveying. The combined survey for the islands and reefs in the South China Sea research in the 20th century is not only the innovation project of marine research in China, but also the first ever marine geodetic survey in the South China Sea. The paper overviews the "four seas measurement" and the "combined survey for the islands and reefs", and juxtaposes the ancient South China Sea survey points calculated by professor Han Zhen-hua and the contemporary geographical position of Huangyan Island on the same picture, which provides a precise and reliable scientific basis for the research and verification of the South China Sea survey points in the "four seas measurement".%元代"四海测验",是中国古代的纬度测量,即天文测量或天文大地测量.而20世纪南海科考"岛礁联测",既是中国海洋科考创新项目,也是首次南海海洋大地测量.本文概述"四海测验"和"岛礁联测",并将韩振华教授推算的古代南海测量点与当代精测黄岩岛地理位置展绘于同一幅图上,为考证"四海测验"南海观测点,提供精确、可靠的科学依据.
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