The invention relates to a groundwater duplex electrometric method which can identify the curve distortion property accurately in a bedrock water-shortage area, fix the well location through the analysis of the electrometric curve distortion, overcome the problem of the water exploration in the bedrock area based on the symmetric-quadrupole electrometric sounding method, and effectively eliminatethe lateral impact, therefore, the duplex electrometric method has the advantages of simplicity, low misjudgment rate and greatly improved well forming rate.