Objective to explore the diagnostic value of ARFI in the quantitativeSevaluation of different types of scirrhosity of carotid plaques. Method based on two-dimensional ultrasound, to divide 141 carotid plaques into soft-plaque,Shard-plaqueSand mixed-plaque groups, then to detect shear wave velocity (SWV), plaqueSthickness and blood lipid levelsSof different types of carotid plaques, and finally to make a comparative analysis. Result the SWV of three different types of carotid plaques has a statistical significance(P<0.0001), soft-plaque is the slowest, mixed-plaque is in the middle, and hard-plaque is fastest. The critical value of mixed-plaque and hard-plaque is 1.57m/s and 2.14m/s by ROC analysis respectively. Conclusion ARFI is a reliable quantitative index to judge the stability of carotid plaques, which is helpful in clinical significance.