Separate drainage system has been used as the guideline for drainage system planning in China, and the rainfall-runoff pollution in industrial parks with separate drainage systems has potential impacts on the water environment. In this study, the rainfall-runoff pollution load of the Hutang textile industrial park was analyzed through simulation of rainfall with the SWMM software and field research. The results show that the peak values of TN, TP, and COD concentrations in runoff during the rainfall with a return period of 0. 25 year were 6. 01 mg/L, 0. 02 mg/L, and 125. 21 mg/L, respectively. The TN and COD concentrations were evidently lower than the grade V level according to the Environmental Quality Standards for Surface Water(GB3838-2002). With the increase of the rainfall return period, the peak values of pollutant concentrations in the runoff would increase. Of the pollutants discharging into Cailing Port, the TN amount accounted for 25. 9% of the total TN emissions, the TP and COD amounts accounted for 4. 4% and 28. 0%, respectively. The TN and COD amounts in the runoff accounted for large proportions in the Hutang textile industrial park. Based on the drainage field survey in the Hutang textile industrial park, some suggestions are proposed, which include strengthening interception of the early-period runoff, promoting water reuse in the park and standard setup of wastewater outfalls in the park and enterprises, in order to reduce the rainfall-runoff impacts on the surrounding water environment.