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Ultra Wide Band(UWB) signal has the advantages of high resolution, low intercept probability, strong penetration ability, and has a good prospect of application in the fields including underwater target detection, localization and communication. This paper presents a generation method of UWB pulse based on the underwater plasma sound source, and establishes the communication channel model of UWB pulse based on the main influence factors including propagation loss and marine environmental noise;Combined with the lake trial data, using Matlab simulation software and Welch spectrum analysis method, the Power Spectrum Density (PSD) of different frequency of UWB pulse propagating to different distances has been studied. The study results have an important reference value to engineering application of underwater plasma UWB pulse, and also have a certain reference significance to design and development of underwater plasma UWB pulse sound source.