To improve the hydrodynamic simulation accuracy of river sections with weirs, a hydrodynamic model considering the complex operation of rubber dams was established. Based on Preissmann four-point finite difference implicit scheme discretization method, a rubber dam numerical simulation calculation process was constructed to make logical judgments, and the substitution method was used to handle the river channel containing rubber dams.One-dimensional hydrodynamic discretized equations of the river channel were then solved. The model was verified using the actual flood process of the rubber dam in the Pihe River Basin, and two different working conditions of dam collapsing and non-dam collapsing were simulated in view of a typical flood process in the Pihe River Basin in recent years. The results show that considering the rubber dam collapsing simulation, the measured data of the Pihe River Basin can be better fitted. The model can effectively simulate the flood evolution process under the influence of rubber dam scheduling and the simulation accuracy during the flood period can be improved. Keywords: rubber dam; hydrodynamic model; flood evolution; numerical simulation; Pihe River Basin 〖FL