Abstract: The Janus-Helmholtz compliant cavity transducer is made up of conventional JH transducer inserting compliant tubes, so the resonance frequency and bandwidth can be controlled by adjusting duty ratio. A kind of compliant tubes with a compressibility coefficient of 3.2e-8 is taken into the design of compliant cavity. Some transmitting performances of the Janus-Helmholtz compliant cavity transducer are estimated by ATILA finite element simulation, the results from which are compared with testing ones. It is shown that the level of sound pressure is achieved up to 190 dB in the frequency band from 300 Hz to 700 Hz and the directivity is omnidirectional below 600 Hz, the corresponding duty ratio is 12%.