Abstract: The selfnoise in cavity is tested in the circling tank, prediction method of cavity's selfnoise induced by turbulent boundary layer is established. The dome vibration is using the simply supported boundary condition, the sound wave in the cavity is expanded using the rigid wall boundary condition, the modal coupling vibration equation between them is established using the radiation boundary condition. The turbulent boundary layer flunctuation pressure is random,the selfnoise power spectrum in the cavity is solved.Test of selfnoise and turbulent pressure is carried out in the circling tank when water flows at the speed of 5 m/s and 8 m/s, the result verifies the theoretical method can predict the real cavity's hydrodynamic noise approximately, the trends are similar, this provides one analytical method for sonar dome's material selection and noise control.