The numerical calculation of submarine’s coupled vibration and radiated sound field is carried out with the BEM and FEM.The vibro-acoustic model is built by software ANSYS and the fluid-structural coupled vibration is also calculated.Then the radiated sound field is worked out by software SYSNOISE and the characteristics of underwater sound radiation of stiffened cylindrical shell covered with damping material in different depth are analyzed.The results show that the effect of static wate must be considered when researching the structure sound radiation

and the damping material can decrease the underwater structure sound radiation obviously.This not only can conduct how to deal with the true submarine’s noise

but also provide the theory of evaluating the effect.