Objective:To observe the action of Quyu Xiaoban Capsule in removing atherosclerosis（AS）with high frequency ultrasonography. Methods:20 rabbits were fed with forage of high cholesterol

and at the end of the 12th week

16 model rabbits were randomly divided into a natural removing group（control group）and a Chinese drug group

8 in each group.Blood lipids determination and high frequency uhrasonography were carried out and the outcomes were compared with the results of pathological examination at the beginning

the end of the 12th week and the end of the 24th week.Results:12 weeks after modeling

blood total cholesterol （TC）

triglyceride（TG）and lower density lipoprotein-cholesterol（LDL-C）in the model rabbit increased significantly and intima- media thiekness（IMT）thickened significantly（P<0.05 or P<0.01）.At the end of the 24th week

all indexes of blood lipids in both groups decreased significantly

and TC

TG and LDL-C in the Chinese drug group were significantly lower than those in the control group

and IMT was significantly smaller than that in the control group（P<0.05）.The corrective walue of the mean intensity of the ultrasonngram of the abdominal aorta（AIIc%）in the model rabbit increased significantly（P<0.01）

and no significant difference between the two groups in morphological examinations was found.Conclusion:Quyu Xiaoban Capsule has the function of removing AS

and high frequency ultrasonography is a reliable method for qualitatively and quantitatively following-up dynamic changes of AS.