Abstract: Underwater sound propagation modeling is always one of the most important and popular problems in underwater warfare environment because sound is now the only medium which can propagate long range in the ocean.It is of important significance to the design and application of sonar.With the development of theory and technology of broadband sound propagation,shallow water geoacoustic inversion,matched-field source localization,underwater simulation,an efficient method for sound field calculation is very important.The parallel algorithm in the underwater sound propagation modeling is studied.According to the framework of DAWNING 4000L high performance computer and under MPI+OpenMP parallel hybrid programming model,the parallel algorithm of ray-mode-parabolic equation model is designed.Computer experiments and performance analysis showed that the parallel program increases parallel efficiency and good expansibility.