The atherosclerotic prevalence and characteristic of atherosclerotic lesion were investigated in the .coronary arteries from 100 subjects who died from accidents and aged 15～30. The results were as follows:Some fatty streak was possibly to transfer into plaque through intermediated lesion. Atherosclerotic plaques of the youn were characterized with proliferative cellular fibrous tissues. The overall prevalence of coronary atherosclerosis was 56. 0% which was higher in males than in females and it also showed increasing tendency with increasing age. The prevalence of coronary stenosis had positive correlation with the prevalence of plaque. The study demonstrated a higher atherosclerotic prevalence, especially the higher prevalence of coronary stenosis,in the young subjects in Beijing,suggesting the prevention and cure of atherosclerosis be emphasized in youth.