For a better understanding of the dynamics of spouted beds, the gas-solid flow in a three-dimensional rectangular spouted bed was simulated using coupled computational fluid dynamics (CFD) and the discrete element method (DEM), and the anisotropic turbulent flow was solved by large eddy simulation (LES). The distributions of gas velocity, particle velocity, subgrid-scale eddy viscosity, gas turbulent intensity and particle turbulent intensity in the simulation results were analysed in detail. In comparison with particle trajectory velocimetry (PTV) analysis, it was found that the particle velocity distributions in the simulation results agree well with those in the experimental results, which also verify the efficiency of the simulation model.