中文摘要：

为了给北京市城区雨水利用提供基础数据，基于近几年北京东南城区17场典型的自然降雨和不同下垫面径流雨水水质检测结果，分析了雨水的水质特性及其化学稳定性．研究结果表明，北京东南城区自然降雨和地表径流雨水水质为重碳酸盐钙组I型；雨水水质已经受到一定程度的污染，主要污染物为有机物和含氮化合物；雨水的pH值与雨水中碱性粒子浓度呈显著的正相关性；水的稳定性主要受CaC03溶解沉淀过程控制，除机动车道径流雨水为沉积性水质外，自然降雨和其他地表径流雨水多呈侵蚀性．因此，在城区雨水利用过程中应注意雨水水质污染和工程设施侵蚀的问题．

英文摘要：

Based on the test results of water quality for seventeen times rain and rainfall in Southeast Region ot Beijing city, it was conducted for a comprehensive water quality investigation of the rain-water and rain-runoff in the area, including characterization of their chemical properties and analysis of the water stability. The in- vestigation results show that the collected rain-water and surface runoff water are soft and Type-I water within the category of bicarbonate calcium. The results also show that the pH is well related with alkaline par- ticles in the rain-water and runoff water within this area. It indicates that the rain-water and runoff water within this area have been contaminated to a certain degree by a nitrogen-compounds or a hydrocarbons from intensive human activities. Water stability analysis in this study focuses on its potential of precipitation and dissolution, in which carbonate calcium （CaC03） plays a dominant role. The results show that only runoff water on traffic roads prefers to precipitate while rain-water and other runoff water in the areas are character- istic of their solubility. Therefore, the problems of polluted rain-water and engineering installations corrosion should be especially awared of during the rain-water usability.