通过对城市化流域雨洪特点的分析，提出用综合瞬时单位线法建立城市雨洪系统综合汇流模型的方法与步骤，并根据北京市实测水文资料进行了实例研究． Based on the analysis of the characteristics of rain and flood in the urbanized basin, the method and procedure of establishing the integrated urban stormwater system confluence model with the integrated instantaneous unit line method are put forward, and the case studies are carried out based on the measured hydrological data in Beijing.