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This paper investigates a theoretical prediction of friction drag reduction in turbulent channel flow which is achieved by using superhydrophobic surfaces.The effect of the hydrophobic surface is considered to be a slip boundary condition on the wall,and this new boundary condition is added to Large Eddy Simulation (LES) equations.The predicted drag reduction at Rer =180 is approximately 30％,which concurs with results obtained from Direct Numerical Simulation (DNS).An important implication of the present finding is that the near-wall turbulence structures are modified with streamwise slip velocity.In addition,a noticeable effect on the turbulence structure occurs when the slip length is greater than a certain value.