We have examined 56 normal subjects, 24 females and 32 males. We have calculated the average maps on the basis of 30 patients of the average age of 24.3 years (SD = 4.91). The aim of our studies was to settle the normal heart potentials mapping. The studies were realized in the Laboratory of Electrophysiology in the Department of Pathophysiology of Wrocław Medical Academy. In order to record the heart potential mapping we have used the HPM 7100 system (Fukuda Denshi). We have analyzed isopotential maps, isointegral maps and ventricular activation time maps. We have calculated the average maps using the information system "Heart-Map" Normal heart potential mapping are necessary for statistic analyzing of heart potentials mapping in patients suffering from the heart diseases.