At Hie present time, studying psychophysiological condition of levels of mental adaptation by means of objective indices is especially actual. Therefore, the identification and assessment of the indices characterizing the functional condition of an organism will allow the expert to decide on the level of mental adaptation. We examined 75 respondents which were divided into groups in correspondence with V.Y. Semke's concept. Primary diagnostic measures included clinical and psychological methods, the assessment of the functional condition of nervous system, short record of variability of cardiac rhythm. Features of psychophysiological condition of processes of regulation and functioning of ground levels of mental health in persons of hazardous occupation are studied. /Is a result of the conducted research, we revealed the reliable changes in the psychoadaptation and psychodisadaptation state in vegetative system of supporting of the processes of regulation of an organism in group (p < 0,05) (according to the indices of spectral analysis of cardiac rhythm and variation ofpulsometry according to R.M. Bayevsky). The tension index increased from 45,92 ± 31,81 to 347,94 ± 434,01 (p < 0,05). Reliable negative dynamics of change of clinical, psychological and psychophysiological indexes is shown upon transition from the first to the third level of mental health (p < 0,05).