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The surface potential distribution is related to the position of electrical power supply�� In order to study the potential distribution with the change of power supply position��we did a series of flume simulation experiments�� using a copper cylinder as a power supply point source��plexiglass plate as an oil layer��utilizing three-dimension resistivity method to test the surface potential of every point arranged on the surface of the water�� The distribution potential on surface may provide physical basis for analyzing distribution of oil layer�� The result of simulation experiment shows that as the abnormal body is closer to the power supply point��the measured anomaly voltage on the surface is higher�� When the supply point located below the anomalous body��the distribution of anomaly voltage is closer to the shape of the anomalous body�� The character of the electric field can be effective to display the disturbance of high resistance body buried below��