Storm flood is one of the natural disasters occurred frequently. It is of great significance to flood mitigation and sustainable utilization of water resources to investigate characteristics of storm flood at catchment scale and its responses to change in climatic factors. According to recorded data of 102 storm floods in Qingliu River catchment, it analyzed the characteristics of storm floods, runoff components, and the response relation between the precipitation feature and index. Results show that flood process are dominated by rainfall pattern. The human activities such as construction of engineering and land use change, etc have certain influence on process characteristics of storm floods.Runoff coefficients of storm flood tend to decrease in general,while the proportion of surface runoff to total storm runoff presents an increasing trend.Total runoff and peak discharges of storm floods highly correlated to storm rainfall,while the rainfall intensity has less impact on the characteristics of storm flood.The saturation runoff is the dominant mechanism of Qingliu River catchment.