红树林捕沙促淤功能是红树林防浪护岸效益的主要表现之一。本文用标志桩法与（２１０）Ｐｂ同位素定年法测定红树林潮滩沉积速率。海南东寨港林市村岸段标志桩试验显示：红海榄Ｒｈｉｚｏｐｈｏｒａｓｔｙｌｏｓａ密林区普遍淤积，平均速率４．１ｍｍ·ａ（－１）；白滩与疏林区侵蚀，平均速率８．２ｍｍ·ａ（－１）。沉积速率随滩地高程增加或潮水浸淹频率的减小而减小。冬春淤积为主而夏季冲刷为主。区域性淤积速度受区域泥沙来源与海岸动态影响。在粤西廉江高桥镇凤地村岸段的（２１０）Ｐｈ测试显示，０—９０ｃｍ段沉积历时为１４５（１８４７—１９９２）ａ，平均沉积速率为６．２ｍｍ·ａ（－１）。其中０—４０ｃｍ段１９６６—１９９２年沉积速率１５．４ｍｍ·ａ（－１）最大，４０—５０ｃｍ段１９３０－１９６６年沉积速率２．８ｍｍ·ａ（－１）最小。 Mangrove catch silt promoting silt function is one of the main performance of mangroves wave protection bank. In this paper, the sedimentary rate of tidal flat of mangroves was determined by the marker pile method and the (210) Pb isotopic dating method. The test results of the flag pile in Lin’an Village of Dongzhai Port in Hainan Province show that the Rhizophorastylosa is generally silted with the average rate of 4.1mm · a -1 and the erosion rate of white beach and sparse forest with an average rate of 8.2mm · a - 1). The deposition rate decreases with the increase of the elevation of the beach or the decrease of the frequency of tide flooding. Sediment-based winter and spring-based scouring in summer. The rate of regional deposition is affected by the source of sediment in the area and the coast dynamics. The (210) Ph test at the bank of Fengdi village in Lianqiao Town of Lianjiang in western Guangdong shows that the sedimentation time in the 0-90cm segment is 145 (1847-1992) a and the average sedimentation rate is 6.2mm · a (-1). The deposition rate of 15.4mm · a (-1) between 0-40cm and 1966-1992 is the largest, and the deposition rate of 2.8mm · a (-1) is the minimum in 40-50cm from 1930-1966.