Quantitative study of the aortic atherosclerosis was performed in 587 males of the indigenous (IP) and in 149 males of non-indigenous population (NIP) at the age of 20 to 59 years in the city of Andizhan according to the WHO program. The course of atherosclerosis was more severe in NIP persons although at the age of up to 40 years the differences in the mean surface of atherosclerotic changes were lacking. The surface of lipid spots was similar in both groups or was somewhat lower in NIP, but these spots in NIP persons were thicker and contained more foam cells and more areas of diffuse lipid deposition. The rate of the surface increase of prominent lesions drastically increased in the 5th decade of life in both groups. The frequency of rhythmical structures in the aorta was the same in both groups; their incidence was higher in cases of pronounced atherosclerosis.