Underwater information perception is a process of gathering sea environment and target signal with acoustic，optical，magnetic，electrical and other sensors，processing the signal and obtaining the characteristics of the sea environment and target. Since the sound wave can transmit over a long range in water，the acoustic information is paid extraordinary attention. The final purpose of underwater information perception is to develop ocean underwater surveillance system，understanding the principles of ocean environment variance，constructing the transparent ocean，and serving the people for exploiting the ocean.
