Abstract: In order to simulate the operating status of the irrigation networks with pipe conveyance under different working conditions, this paper presents a numerical simulation model based on the mass conservation law and energy conservation law of constant flow. In this model, the equations of hydraulic state are established respectively to indicate the irrigation networks with pipe conveyance by using the bisection method to solve the equations respectively, the simulation results include the actual working points of the main nodes of the pipelines and the outlets, and the actual flow rate, head, power and efficiency of pumps. The case analysis shows that the model converges rapidly under the condition of each rotational irrigation schemes, the simulation results provide an important basis for water management of the system and the optimization of the engineering designs, which reflects a good practical application value.