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According to impedance mismatch and wave conversion in non-homogeneous structure, the characteristics of vibration wave propagation from typical hull link structures are analyzed through wave theory. Furthermore, elastic interlayer are introduced into L-typed hull structure with blocking mass, the main factor of hull structure-borne sound can be reduced by structuring multi impedance mismatch. On this basis, the structure acoustic design of power cabin with integrated wave impeding technique is verified through numerical calculation. The results show that combination of finite scale of polyurethane elastic interlayer with rigid vibration isolation can enhance the vibration isolation performance and expand isolation frequency band, which has a high cost-effective ratio.