In order to optimize the performance of graphene electroacoustic transducer, the research on the electroacoustic mechanism of graphene thermoacoustic sound device and graphene electrostatic sound device was conducted. Through theory modeling and analysis, the influence of structural parameters such as size, thickness and stress of graphene film on the frequency response characteristics of two kinds of electroacoustic transducers was obtained. Finally, a batch of electroacoustic transducers with different structural parameters were designed and fabricated. The performance test and comparison analysis of these devices show that the thickness of graphene film has a significant influence on the sound pressure of the thermoacoustic transducer, that is, the thinner the film is, the larger the sound pressure of the electroacoustic transducer is. The electrostatic transducer is influenced by the radius, thickness and stress of graphene film, that is, the corresponding film with larger radius, thinner thickness and smaller stress of the electrostatic transducer will have a wider frequency bandwidth. This research can lend support for the optimizing selection of graphene electroacoustic transducer, the optimizing design of structural parameters and the improvement of the device′s sound performance.