Abstract:In order to solve the problems of automatic detection grounding resistance and long-distance data transmission, this paper designed an earth resistance automatic detecting system with GPRS capabilities which is based on the principle of a short-distance method for measuring grounding resistance and single-chip microcomputer. System lower machine composed of current source module production from DDS, A/D Conversion module, GPRS module and man-machine interaction module. Using the non-power frequency method to selected the frequency to eliminate the mechanical power frequency interference. Designed a computer management system by using Delphi .Realized the grounding resistance of the remote automatic measurement and control, the grounding resistance is corrected by coefficient of the season, and the error brought by the manual measuring is avoided.