Abstract: A type of radially composite piezoelectric ceramic tubular transducer in radial vibration was presented and its radial vibration was studied. The transducer is composed of a radially polarized piezoelectric ceramic tube and a metal tube. First, the radial vibration of the composite transducer is studied analytically; the electro-mechanical equivalent circuit for the radially polarized piezoelectric tube and the metal tube in radial vibration is obtained. Based on the mechanical boundary conditions, the six-port electro-mechanical equivalent circuit for the composite tubular transducer is given; the resonance/anti-resonance frequency equations are obtained. The relationship between the resonanc/antiresonance frequencies with the geometrical dimensions of the transducer is analyzed. Second, numerical method is used to simulate the radial vibration of the composite transducer, and the simulated results are compared with those from the analytical method. Third, some composite piezoelectric ceramic tubular transducer in radial vibration are designed and manufactured. The resonance/anti-resonance frequencies are measured by using Precision Impedance Analyzer. It is shown that the analytical results are in good agreement with the simulated and experimental results. It is expected that the radially composite piezoelectric ceramic tubular transducer in radial vibration can be used in ultrasonic liquid processing and sonar technology.