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The lattice Boltzmann method was combined with the method of dynamical systems subgrid model of large-eddy simulation, which couples the large and small scales, and applied to numerical simulation of the three-dimensional cavity ows.The results are compared with the ones of direct numerical simulation of turbulence.A new method of dynamics SGS model with LBM is described in detail and a new average method of eliminating the inherent unphysical oscillation of LBM are given in this paper.