Through the Large eddy Simulation (LES) of water flow field in turbulent state on super hydrophobic surface shows the development of gas membranes process on the hydrophobic surface, and summed up the drag reduction basic rule when flow changes are stable. Use the model of LES. The gas-liquid two phase flow model using VOF multiphase flow model, hydrophobic surface microstructure grid using local encryption technology. The results show that the gas in the micro-structure of hydrophobic surface changed with flow, ultimately, a stable gas vortex formed in the upper part of each groove; the drag reduction rate of hydrophobic surface first increase and then decrease slowly with the groove depth increase, and increase with the free shear increases, increase slowly with the flow velocity increase.