Objective    To analyze the application of color Doppler ultrasonography in diagnosis of  diabetic carotid sclerosis and to study the relation between diabetes and carotid sclerosis.     Methods    Color Doppler ultrasound findings in 68 hospitalized type 2 diabetes patients (as an observation group) and in 73 healthy individuals (as a control group) were compared and analyzed from Feb. 2007 to Feb. 2009.     Results    The tunica intima and media of carotid were significantly thicker in observation group than in control group (P0.01). The incidence rate of plaques was significantly higher in observation group than in control group（82.35% vs 23.28%

P0.01）while that of carotid sclerosis was obviously lower in patients (age60) than in those (age≥60) of observation group (18.75% vs 76.92%，P0.01）.The change in haemodynamics was more obvious in patients with mild and severe stenosis

the blood flow was rapider

the volume of blood flow was lower which was manifested as frequent filling

increased flow rate in terminal diastolic phase

and increased PI and RI

in observation group than in control group（P0.01）.     Conclusion    Color Doppler ultrasonography can accurately detect the plaques

nature and vascular lesion of carotid sclerosis.