本文介绍了收集雨水工程的发展趋势与作用;从缓解资源性缺水、缓解工程性缺水和充分有效利用雨洪资源、缓解区域性缺水的角度,论述了在城区实施雨水收集工程的必要性;论述了集雨工程的系统组成和集蓄水量的确定方法;阐述了集雨工程建设应注意的问题。 This paper introduces the development trends and functions of rainwater harvesting projects. From the perspective of alleviating water resources scarcity, alleviating engineering water scarcity, making full and effective use of rainwater resources and alleviating regional water scarcity, this paper discusses the necessity of implementing rainwater harvesting projects in urban areas The system composition of rainwater harvesting project and the method of determining the amount of water storage are expounded; the problems that should be paid attention to in rainwater harvesting project construction are expounded.