The ultrasonic vibration spherical focusing system based on the longitudinal bending vibration conversion is proposed in this paper, the spherical focusing system is composed of the sandwiched longitudinal vibration transducer and spherical shell with holes. With the plates and shells vibration theory and Helmholtz Kirchhoff theory the vibration and focusing properties of the new focusing system are analyzed and verified experimentally. It has been shown through above research that the acoustic radiation field of the new system is of good focusing property. The focal point position, shape and the sound intensity are influenced by the spherical radius. Under the same structure, the focusing property is influenced by the resonant frequency. The new system is of better application as it has better impedance matching property.