A new type of radial extrusion piezoelectric transducer for ultrasonic bearing was proposed,and its mechanical and electrical characteristic was analyzed by the finite element method.The finite element modeling method was ascertained.The harmonic frequency and radial maximum amplitude of piezoelectric transducer was analyzed from the perspectives of the modal analysis.According to the results of modal analysis, the amplitude frequency characteristics of piezoelectric transducer were calculated by the harmonic response analysis. The structure of piezoelectric transducer was optimized by the orthogonal method, thus a prototype of transducer with best structure was fabricated and the operating frequency was tested.The experimental testified that the finite element calculation result of harmonic frequency of transducer was well consistent with the result of experimental result,which proved an important value for design and research of piezoelectric transducer for ultrasonic bearing.