Abstract: The proportion of urban nonpoint source (NPS) pollution in watershed NPS pollution is increasing with urbanization. Urban NPS pollution is becoming research hotspot. In this study, rainfallrunoff model was validated in a typical housing estate of Shenyang based on the measured data with the distributed hydrological model method (SWMM) to analyze the trends of rainfall runoff and urban NPS pollution under different recurrence intervals and rainfall types. The results indicated that the accuracy of runoff simulation was greater than 0.7. The total simulation accuracies of TSS, TN, TP, and COD loads were acceptable; however, the simulation accuracy of heavy metal was lower than that of nutrient pollution. Increased rainfall had a great influence on pollutant discharge. The runoff increased by 274.13% with the increase of recurrence interval of rainfall intensity from 0.25 years to 5 years. At the same time, the total emission of TSS, TN, TP and COD increased by 83.18%, 119.37%, 103.15% and 78.07%, respectively. For different types of rainfall, the earlier the rainfall peak appeared, the greater the peak concentration of pollutants happened. Our results provide a scientific support for urban NPS pollution estimation and sponge city construction.