Abstract: To investigate the hemodynamics parameter of stress phase angle (SPA) in different stenosis states, the high-frequency ultrasonic imaging system was employed to obtain ultrasound contrast images of stenotic plaques, and the value of SPA was calculated through echo particle image velocimetry and cross-correlation algorithms. The experimental results showed that when the stenosis was 30%, 50% and 70%, the mean SPA was －162.88°, －201.99° and －222.89°, respectively. The study may suggest that the bigger stenosis, the more negative the SPA and the more asynchronous between the wall shear stress and circumferential stress.