Abstract: In this article, the principle of precipitation measurement using digital weather radar was introduced briefly, the error in the measuring process and its causing factors were analyzed, and then the methods or steps to reduce the error to lower level were discussed. Finally, having the introduction of operational radar nets in United Kingdom, American, and in the middle stream of Yangtze River, and the experiment project using the Fu Yang digital radar in Anhui Province, the future application of radar in hydrology, especially in precipitation measuring and monitoring, was discussed and prospected.