Objective To investigate the diagnosis and application value of Color Doppler Flow Imaging(CDFI)and Transcranial Doppler(TCD)on blood hemodynamics of carotid artery and cerebral arteries in patients with type 2 diabetes mellitus.Methods Sixty-seven patients with type 2 diabetes mellitus and 53 normal subjects were examined on blood hemodynamics of carotid artery and cerebral arteries by CDFI and TCD,and their ultrasonographic features were recorded and compared.Results Forty-six of 67 patients have atherosclerosis on carotid artery by CDFI,56 of 67 patients have abnormal on cerebral arteries by TCD,there were significant difference between the patients and normal groups(P