Abstract: Objective: To explore the role of color doppler ultrasound in comparing the effects before and after treatment of carotid atherosclerotic plaque with Chinese medicine.Methods: Color doppler ultrasound was performed in 58 cases of carotid atherosclerosis.The echo property,size,inner and media thickness of the plaque,the stenosis of the lumens and the extent of the narrow spectrum of color doppler flow parameter changes were observed before and after the application of Chinese medicine.Results: The plaque in the treatment group was deflated to varied degree,the diameter of the intracavity was expanded,and the inner and media thickness was reduced(P<0.01).Conclusions: Color doppler ultrasound can accurately monitor the size of the carotid atherosclerotic plaque and assess the stenosis degree of the blood vessels,which may provide basis for early diagnosis and treatment of cerebrovascular diseases,thus reducing the incidence of cerebral infarction.