Abstract: A storm water management model（SWMM） is conducted on the basis of model calibration and validation with synchronized monitoring data of rainfall,runoff water quantity and quality in Tianhe Wisdom City. The SWMM model is applied to simulate LID in natural,semi-saturation and saturation conditions of runoff control and contaminant reduction in different rainfall return periods. The results indicate that the runoff control rate of all LID conditions decrease with rainfall return period increasing,the highest runoff control rate is natural LID condition,saturation LID condition shows not significant variation in different rainfall return periods. Compared with natural LID condition,the rate of runoff peak discharge and contaminant control decrease in semi-saturation and saturation LID condition. The investigation of different initial LID conditions can provide guidance for the LID planning,designing and operation management.