In order to improve the contrast and resolution of ultrasound imaging, this paper studies a target scattering imaging method based on a spherical shell focused array. The partial array elements in the spherical shell focused array transmit the focused sound waves. When the sound waves act on the target scattering occurs, and the scattered echoes are received by the remaining array elements. The transmitting and receiving elements in the array are selected randomly to suppress the side lobes. Using the threedimensional automatic scanning mechanism, the scattered echo intensity of the focused beam along the surface of the measured object can be obtained, then the target imaging is realized. Computer simulation results show that the spherical shell focused array can decrease the mainlobe width and effectively reduce the side lobes of the focused beam. The water tank experiment results show that the scattering imaging method based on spherical shell focused array possesses a submillimeter level imaging resolution and could obtain high contrast image.