This paper briefly overviews the recent surface design for the purpose of achieving the good wind ability of polyester films and its application to the substrate films for the magnetic recording media.One example is concerning the application to the films for VHS video tapes. The authors found it is quite important to remove the air layer from between each layer of the wound films in order to get a good roll formation in the VHS tape production process and we were successful in solving the roll formation problem by introducing a unique technology.The other is concerning the application to the films for high density magnetic recording tapes such as 8 mm video or professional video, for which one of the requirement to the substrate films is to achieve quite a smooth surface and a good wind ability at the same time. The authors made it possible and were successful in reducing cost by introducing the dual surface film manufacturing technology and a technology to form fine and minute protrusions on the surface of the film and their combination