This paper introduces a new approach of collecting rainwater on building roofs based on the diversion of rainwater in roof drainage pipes. A case study for a fiat - topped apartment building in Chongqing is presented, in which every room was equipped with the diversion system. The cost of the systems was about￥ 1.59 per square meter, and might be recovered in about 2.2 years. The rainwater harvesting system shows advantages because of its simple structure, environmental materials, low cost, and considerable economical benefits. The systems may provide a promising way of the roof rainwater utilization for green building tech- nology.%提出了一种屋面集雨新技术——雨落管分流集雨装置，以重庆地区某高校一栋平顶学生宿舍单元楼作为实例，当每个单间都安装该装置时，定量计算得其材料成本费用约1．59元／m^2，2．2年左右即可全部收回成本．该装置具有整体构造简单、材料使用环保、成本费用低廉、直接经济效益可观等优点，在雨水综合利用系统领域内拥有广阔的发展前景．
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