Objective: To explore the clinical value of color Doppler ultrasound in evaluation of carotid artery before and after treatment of diabetes cases.Methods:A total of 80 cases of Type 2 Diabetes were examined with color Doppler ultrasound before and after treatment in Carotidor. Their carotid artery wall,lumen,intima-media thickness and plaque size,and flow conditions were analyzed respectively, ResuLts: In 80 cases of type 2 diabetes detection rates of carotid artery atherosclerotic plaque after treatment were lower than those before treatment,and the carotid artery diameter,Intima-media thickness and resistance index were reduced too. Conclusion:Using color Doppler ultrasound in carotid artery,can be directly observe large vascular wall and luminal lesions,and has a important clinical value in the prevention of diabetic carotid atherosclerosis and formulation the means of intervention,and it has broad application prospects in suppression of diabetic macrovascular disease development.