A method for repairing a guide vane segment of a gas turbine, the guide vane segment including at least two guide vanes as well as an inner and an outer shroud. At least one guide vane is irreparably damaged and is separated from the guide vane segment while the guide vane segment is completed by joining at least one replacement vane. If the one irreparable guide vane is located in one half of the segment outside the circumferential center of the guide vane segment, or if the several irreparable guide vanes are located in the same half of the segment, the matching number of guide vanes to be separated from the segment and replacement vanes to be joined to the segment are determined first. The determined number of replacement vanes are then joined to the guide vane segment. The same number of guide vanes, including the at least one irreparable guide vane, are finally separated from the guide vane segment.