Urban non-point source pollution has become a key object of urban water environment governance in China, but due to the uneven distribution of time and space, random pollution routes and complex and changeable composition, the treatment of urban non-point source pollution is more difficult. On the basis of full research, the SWMM model of the Sanba River Basin of Xuzhou Economic and Technological Development Zone was established, and the effects of single LID measures and combined LID measures on source pollution reduction under different recurrence periods (1 year, 2 years, 3 years, 5 years, 10 years) were simulated and analyzed. Simulation result surface: the higher the proportion of LID control measures, the better the reduction effect on pollutants; Urban runoff pollution is greatly affected by the intensity of rainfall, and the greater the rainfall intensity, the lower the average concentration of runoff pollutants; Biostasis facilities are better at reducing pollutants than rain gardens and green roofs; When lid measures are used in combination, multiple source control measures do not show a superposition effect, and it is recommended to apply a combination of source control measures and end control measures to improve the effect of pollutant reduction.