Abstract: A method for making surface corona discharge, which produces ozone gas and apparatus for producing the same are disclosed, in which a dielectric spacer/film having a specific capacity C′ equal to or more than 200 nanofarad per square meter positioned between the base electrode and the net electrode. Said net electrode is a wire net or a perforated metal or a wire winding having an open area not less than about 70%, and a size of hole D equals to or less than about 0.7V/P, where V is a voltage in kilovolts and P is pressure of an ambient air or an oxygen in atmospheres. Net electrode has radius R of wire or radius of an edge of openings in the perforated metal equal to or more than about 1.6d, where d is the thickness of the said dielectric spacer/film, which is determined by a fundamental formula d=9k/C′, where d is in millimeters, C′ is in nF/m2, and k is dimensionless dielectric constant k of given material.