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[Objective] This study was conducted to investigate the effect of laundry wastewater on the quality of river water and the dilution purification effect of river water on laundry wastewater.[Method] The effects of laundry wastewater on the contents of total nitrogen (TN),total phosphorus (TP),suspended solids (SS),chemical oxygen demand (COD) and linear alkylhenzene sulfonic acid (LAS) were studied in 7 rivers of Shaoxing City.[Result] (1) The contents of TN,TP,SS,COD and LAS increased by 92％,99％,340％,351％ and 923％,respectively,at the discharging moment of laundry wastewater;and (2) the five pollutional indexes significantly decreased over time,and especially 2 h after the discharge of laundry wastewater,compared with former the discharge of laundry wastewater,the contents of TN,TP,COD and ILAS increased by 6％,11％,9％ and13％,respectively,while the contents of SS still increased by 76％,i.e.,SS required a longer time to achieve serf-purification.[Conclusion] Laundry wastewater has some influence on thequality of river water,and the self-purification function of river water could effectively remove pollutants.