The purpose of this study is identifying and characterizing the hydrological process of urban roof runoff,as well as concentrating variation of pollutants.The aim is to provide the base for the effective utilization of rainwater in city and the control of non-point pollution.The urban roof rainfall was collected in Xinxiang City by volume method.The examples were taken to analyze the contents of pH,SS,COD,and DO.The runoff coefficient of roof is 0.92~0.98.At the beginning the runoff water quality is bad,and...