Aim The paper was done to evaluate the relations between intima-media thickness (IMT) of common carotid artery (CCA) and plaque in the internal carotid artery (ICA) and bifurcations (CBs). Methods B-mode ultrasound examination of carotid arteries was per formed in 91 subjects. B-mode ultrasound examination include measurement of CCA-IMT and the sites of plaque in the ICA and CBs. Results The results showed that the prevalence of plaque increased from the lowest to the highest quintile of IMT(linear trend:P<0.01). The mean IMT was lower in subjects without plaques than in subjects with plaques (0.64±0.12 mm vs 0.83±0.16 mm,P<0.01), there was an increasing trend for IMT with the severity of plaque. Conclusion Increases in IMT as measured in the CCA are clearly related to atherosclerotic plaque in the ICA and CBs.