The DWJ-1 microprocessing induced polarization instrument, an "intelli gent" type device designed by Chinese engineers, was technically approved byexperts organized by Ministry of Geology and Mineral Resources of China and are now being produced in batch by Beijing Geological Instruments Factory.This instrument has much to commend it. It is simple in operation; the polarization compensation and survey selection are not required-the only thing to do is to press the starter button- observation precision is high; the superposition average can be obtained for primary potential and the average value can be extracted for polarizability after automatically giving up the superheterodyne; the self-potential tracking is reasonable; the self-checking program and debugging routine are perfect, so the instrument is easy to be kept in good maintenance.Due to its small volume and light weight, this instrument is suitable for reconnaissance geophysical survey, especially for short traverse line survey and near-source "identical point" survey.