Abstract: The noise generated by the propeller is the major contribution to the total noise of naval vessel.This paper uses a finite truncated conical shell to simulate the stern of submarine and analyzes the sound and vibrati on of a truncated conical shell under excitation of dipole source and force,Moreover,a discussion on the position of excitation is presented.The acquired conclusions show that the sound and vibration caused by the exci ting force are larger than those by the dipole source.When the dipole source is at the center of shell＇s section,the sound and vibration of the shell are smaller than those at asymmetrical place.