Abstract: Vibration isolation of torpedo power is very important to control vibration and noise of torpedo. By means of four-end parameter analysis method, a simplified vibration transfermodel of isolator is established based on the force analysis of the vibration isolation ring of torpedo power. The vibration transfer loss is analy zed, and the influence factors such as the ring structure, rubber hardness and rubber damping on vibration transfer are also discussed. The conclusion in dicates that the four-end parameter analysis method is suitable to the vibra tion isolation analysis of the complicated structure of vibration isolation ring, and the vibration isolation can be obviously improved with this method by reducing rubber hardness, and increasing rubber dam ping and rubber length.