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The problem of communication in the sea has been considered by many writers. They regarded the sea as a two-layered media, and the bottom of the sea has not been included. However, the effect of the sea bottom cannot be neglected in some situations, for example in the case of a low frequency, a shallow sea, and the access of a transmitter or receiver to the sea bottom. The effect of the sea bottom on radio wave propagation is ascertained theoretically, and it will act as an important part in such cases. Considering a three-layered sea, the multipath reflection and multilateral waves that cannot be generated in a two-layered media are obtained.