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Based on the weighted residual method and using the discrete ideas of the control volume method, the paper researches the macroscopic traffic flow models which depend on the velocity-density relation. It proposes a novel meso-simulation traffic flow model. And it establishes the meso-simulation model based on the Payne model and studies the numerical solution of the new meso-model. Simulation results show that the simulation results of the meso-model are realistic and it has a higher flexibility.