Abstract: This research is devoted to the application of the phase-metric method of geodynamic control to solving of the problems of monitoring karst processes as well as the analysis of the influence of multiplicative natural noise on the results of geodynamic control. It is noted that the applied phase-metric method of recording geoelectrical signals allows eliminating the multiplicative interference and increasing the accuracy of geoelectric control. A theoretical evaluation of the dependence of the attenuation of multiplicative interference on the basis of the model of geodynamic control of a karst suffusion cavity using a two-pole phase-metric electrical installation is presented. The developed device for recording geodynamics of near-surface inhomogeneities is described. The results of experimental studies of full-scale modeling of geodynamic control of the karst suffusion cavity development using a two-pole phase-meter electrical installation are presented. As part of the experiment, registration of geodynamic variations was carried out to obtain comparative data an equipotential geodynamic control method was used with simultaneous application of the phase-metric method.