A method comprises: generating a shear wave in a target tissue; selecting an ultrasound transducer group in an ultrasound probe, and determining a focus position and a transmitting aperture corresponding to the ultrasound transducer group, such that a sound field boundary range formed by the ultrasound transducer group completely covers a region of interest in the target tissue; controlling the array elements to transmit ultrasound waves according to the corresponding relative time delays, so as to cause a transmitting focusing effect; receiving ultrasound echoes returned from the region of interest, obtaining echo information of different positions in the region of interest, and obtaining, according to the echo information, shear wave information corresponding to the region of interest.