Abstract: The irregular sea is considered as the sea area with irregular horizontal and bottom boundary shapes and the complicated boundary conditions.By ray acoustics theory,the monostatic reverberation intensity simulation model for irregular sea is established by using Lambert’s law to calculate scattering strength of the bottom and lateral wall.The monostatic reverberation intensity of the simulation model is in consistent with the reverberation intensity of the ex-perimental data.The simulation model can calculate reverberation intensity of the irregular sea area accurately.