Abstract: A thin plate acoustic radiator made of Polyoxymethylene (POM) was studied. The plate was excited by a piezoelectric transducer at its center. The POM plate was designed by analytical method, and the POM plate-transducer vibration system was modeled and calculated by finite element method. At the resonant frequency of the system, the vibration displacement of the plate and the electroacoustic efficiency of the system were calculated by finite element method and measured by experiment. The results show that when the radius and thickness of the POM plate and the steel plate are the same, the half power bandwidth of the POM plate-transducer vibration system in air is wider, while the electroacoustic efficiency of the steel plate-transducer vibration system is higher. The POM plate-transducer vibration system is easier to be applied higher voltage or active power. When the excitation voltages are the same, the vibration displacement of the POM plate is greater than that of the steel plate.