Abstract: ABSTRACT：　Objective　To evaluate the relationship between common carotid artery (CCA) intima-media thickness (IMT),common carotid artery diameter(D) and carotid artery atherosclerosis(CAS) by ultrasonograph . Investigated IMT and D as a sensitivity indicator of the CAS,and to provide an early prevention for cerebral infarction. . Methods　 The carotid artery of 40 high-risk group and the 40 mild dangerous group with hypertension were assessed by color Doppler ultrasonography. IMT and D were measured at the common carotid arteries .Results ①The IMT, D of hypertension the high-risk group are higher than the mild dangerous group obviously（P <0.05 ）；②There was a significant difference in abnormal rate of isolated IMT or D between hypertension high-risk group and mild dangerous group（P <0.05 ），but there was a extremely significant difference with the abnormality both IMT and D to compare（P <0.01） . Conclusion The enlargement of common carotid artery IMT and D as a objective maker to CAS, but coexistent abnormalities of IMT and D are more sensitive to CAS.

Key words: Carotid artery Atherosclerosis, Common carotid artery, Intima-media thickness, Diameter