Drag reduction can be easily obtained by the hydrophobic surface,this function can be used in many practical applications,such as improving efficiency in pipeline transmission and reducing flow resistance in microfluidic devices.Three research aspects about the preparation of superhydrophobic surface,slip theory and the drag reduction of superhydrophobic surface,and the main influence factors of drag reduction,including wettability,micro structure and flow field were introduced.The physical mechanism of drag reduction on superhydrophobic surfaces was summarized.It was pointed out that the discontinuous gas layer model and the air cavity model are the drag reduction model for the smooth hydrophobic surface and the superhydrophobic surface with micro structures,respectively.Some practical applications of superhydrophobic surfaces’drag reduction were presented,and some potential problems which would be faced in the process of applying superhyphobic surfaces into the field of micro system,such as the preparation of wall’s hydrophobicity and its durability for drag reduction,were proposed.