As an artificial ecosystem,green roofs are an important supplement for urban green system, which can lessen and mitigate many urban ecological and environmental problems.In recent 20 years,green roofs have won some development, but their developing rate is very slow. The main reason is that Chinese people don’t have enough recognition on the improving effect of green roofs on urban environment and ecologi-cal system.Though researchers at home and abroad have achieved consensus on the absorbing and retaining effect of green roofs,on roof runoff and on its lessening urban flood effect,they have controversial views on how green roofs affect the quality of roof runoff.By reviewing the studies on the topic of the effect of green roofs on roof runoff quantity and quality in the past 20 years,the advances and controversies were shown,and the main problems were analyzed and the developing trends in this field were predicted as well.52refs.%屋顶绿化作为城市人工生态系统，是改善城市绿化的补充，能缓解众多城市生态环境的问题.最近20年，虽然屋顶绿化在国内有一些发展，但发展速度十分缓慢，主要问题在于人们对屋顶绿化改善城市生态环境的作用认识不够.虽然国内外学者对于屋顶绿化吸收和截留屋面径流、减轻城市内涝灾害的认识已经取得了一致，但学术界对屋顶绿化怎样影响屋面径流水质还存在争议.通过对最近20年国内外学者在屋顶绿化对屋面径流的水质和水量的影响研究综述，系统介绍了这个领域的进展和争议，分析了存在的主要问题，展望了未来可能的发展方向.参52.
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