Based on the exploration of the permanent largescale water supply source area in Yulin City of Shaanxi Province, this paper presents the application effects of such technologies as symmetrical fourpole electrical sounding method, transient electromagnetic method, high density resistivity method and IP method. It is concluded that the application of the integrated electrical technology to the exploration of permanent largescale or superlarge water supply source areas has the advantages of high interpretation precision and reliability, thus being effective in geological work.