Abstract:The hydraulic model software infoworks-icm is used to establish the hydraulic model of the drainage pipe network in Daocha River Area of Xuancheng City. The drainage situation of the area is simulated and calculated when the design rainfall occurs once in three years. The drainage capacity of the pipeline is evaluated by using the hydraulic gradient method, and the fixed-point reconstruction at the pipeline bottleneck is carried out according to the evaluation results. The results show that the use of the hydraulic model software can quickly and intuitively find the drainage bottleneck, and clarify the location of engineering reconstruction, which effectively improves the efficiency of engineering reconstruction. The pipeline network after reconstructed can better meet the requirements of the new standard.