Abstract: The construction of urban eco-park water systems will be connected with the existing river channels, which will have a certain impact on the flood discharge and river regime stability. Based on GIS hydrological mode, MIKE11 and Mike21 hydrodynamic models were used to construct the runoff and confluence model, one-dimensional hydrodynamic model of river channel and two-dimensional hydrodynamic model of eco-park water systems. Through the model analysis, the design flood process of river course under different inflow frequencies and the inundation range of ecological park water systems construction area are calculated, carry out flood impact assessment on river flood safety, river stability, park construction projects, levees and other hydraulic engineering facilities, and propose corresponding prevention and control measures, provide support for the construction of urban eco-park water systems.