Abstract: According to impedance mismatch and wave mode conversion in heterogeneous structure which based on wave analysis method，the characteristics of vibration wave propagation in typical submarine structure were studied. Based on this，vibration and noise reduction performance of artificial transmission loss base was analyzed through FEM/BEM coupled method. By reviewing vibration wave transmission characteristics for composite plate，the conclusions are drawn that the structure impedance changes，when the structure cross section mutates. Thus，leading to impedance mismatch between the structures，so the vibration wave will reflect and transmit in the mutant cross-section，and reduce the transmission rate of vibration. An artificially constructed transmission loss base was designed using the theory，and the vibration and noise reduction performance of the base was verified by FEM / BEM coupled method.