选取2016年1—12月GPM(Global Precipitation Measurement)卫星的IMERG月尺度降水数据为研究对象，以同时期的气象站点实测降水数据为参考，利用相关系数、标准偏差、相对误差等多种统计分析指标对其在沿海地区估测能力进行评价。结果表明：IMERG月尺度降水量与站点实测降水数据相关性较好，IMERG估测的降水与气象站点实测降水量的时空变化规律也较为一致，但是量化到具体数值而言，其对山区、海岛站的估测能力不及地势平坦的区域；同时，选取降水个例对IMERG日尺度和半小时尺度降水数据的分析表明，日尺度IMERG估测的不同等级降水量也存在偏差，半小时尺度IMERG降水数据对海岛站的降水估测偏高。总体而言，IMERG降水数据对降水的时间变化规律和空间分布格局估测较为合理，但是对山区、海岛地区，其降水估测值还存在偏差，在今后应用中需结合地形特征加以合理利用。
The uncertainty of the satellite precipitation products limits their applicability in coastal areas. This paper evaluates the applicability of a new precipitation product IMERG from Global Precipitation Measurements (GPM) in Sanya based on the meteorological stations data. The measured precipitation data of meteorological stations in 2016 are used to evaluate and compare the accuracy of IMERG data. Correlation coefficient, Standard Deviation and Percent Bias are used to assess the applicability of IMERG data. The results show: There was a significant correlation between IMERG and the observed data. The IMERG precipitation data and the measured precipitation from meteorological stations have an identical spatialtemporal variation regularity, but in the mountain areas and islands, the estimated precipitation of IMERG is not as good as that in plain areas. At the same time, the analysis of daily and halfhour IMERG data shows that there are also deviations of the precipitation estimated by daily IMERG data for different grades, and the estimated precipitation of halfhour IMERG data is higher in the island stations. Generally speaking, IMERG precipitation data are reasonable in estimating temporal variation and spatial distribution patterns of precipitation, but there are still some deviations in the estimation of rainfall in mountainous and island areas. Therefore, IMERG data should be used reasonably in combination with topographic information in the future.