Acoustical method is the only method of ocean remote observation. Compared with other waves, the absorption less of acoustic wave by sea water is very lower. The IOC (Intergovernmental Oceanographic Commission) has carried out the GOOS(Global Ocean Observation System) program. Some parameters of ocean environment can be measured by means of the inversion of the acoustic field theory. In this paper the following applications are discussed. a) Profiling of the current with Doppler or correlation technique. b) Inversion of sea surface wave direction and/or wind field by means of bottom-mounted acoustical device. c) Measurement the sound velocity, attenuation, temperature, salinity of sea water and the density and particle diameter spectrum of suspended sediment in sea water, by means of standing wave resonance of sweep-frequency ultrasonic wave as well as acousto-optical diffraction. d) Detection the detail topography with SAS (Synthetic Aperture Sonar). e) The progress of underwater information transmission using the state-of-the-art acoustic field theory.
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