The invention discloses a drag reduced conductor and a method for forming spline curves in the drag reduced conductor. The drag reduced conductor includes an inner conductor layer composed of aluminum wires, an outer conductor layer which wraps the periphery of the inner conductor layer and is composed of aluminum wires, and an aluminum wire layer arranged outside the outer conductor layer; the surface structure of the aluminum wire layer is composed of a plurality of spline curves with the same local structure; and the shape of each spline curve is defined by two control points at the highest points at two ends of the corresponding spline curve and a distance from a point on the angular bisector of the two control points to the outer diameter of the conductor. According to the drag reduced conductor and the method for forming the spline curves in the drag reduced conductor of the invention, the aluminum wire structures of the outermost layer of the conductor are changed in a manner that traditional circular lines and fan-shaped structures are changed into curved line structures, and therefore, the surface of the conductor has a certain roughness, and therefore, drag can be reduced. The structures of the molded lines are monotonous, and therefore, molds for producing the molded lines can be monotonous, the lines will not be disordered when being stranded, and processing and production can be facilitated.