A barrier discharge is a high voltage non-stationary discharge which appears in an interelectrode space where at least one solid dielectric barrier is on a path of discharge. Dielectric barriers are used to rise the breakdown voltage in different high voltage devices. That’s why a barrier effect demands a versatile research: for direct, alternating and impulse voltage. This article us devoted to research of influence of a barrier which is placed parallel to the plane electrode on corona discharge form and breakdown voltage. Dependence of discharge processes on electrode-plane distance and detailed research of charge distribution on dielectric surface are also in focus of this work.