To develop a propagation model of a local discharge on a wet polluted insulator，the authors have examined characteristics of the local discharge on an electrolytic solution simulating the wet polluted insulator surface. The local discharge was propagated on the solution under an impulse voltage. A shape of a contacting surface between the local discharge and the solution has been already obtained by the authors. By using the contacting surface，an electric potential near a tip of the local discharge on a conductive film of 0.1 to 0.2 mm in thickness was calculated. Furthermore，the potential was measured with a probe. The calculated values and the measured values of the electric potential agreed well regardless of the propagation length of the local discharge，the resistivity of the conductive film and the peak value of the applied voltage.

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