Abstract: An algorithm to combine the Lattice-Boltzmann (LB) method and the sub-grid model is introduced and is used to simulate the flow around a cylinder under subcritical Reynolds number. The obtained streamline of the fl ow field and the pressure coefficient around the cylinder are found to agree well with the data from tests. The agreement indicates that the discussed method suits those problems with relatively high Reynolds number an d inherits the computation efficiency of the LB method.