JAMSTEC is conducting research and development of communication systems between underwater and land in cooperation with research institutes and manufactures. For communication between underwater and sea surface, researches of high speed acoustic communication, underwater laser communication, and radio wave communication are performed. A part of these researches including physical research of propagation is still basic research. We achieved an 80 kbps data transmission at distance of 510 m with acoustic communication, and an underwater laser communication with 10 MHz band width at distance of 20 m.