Abstract: The method based on elastic parabolic equation method for calculating the sound vector field has been studied.The vector field of infra-sound in oceanic environment with elastic wedge bottom and seismic wave filed with elastic bottom have been calculated.The effects on sound field distribution for different frequency and depth of sound source have been researched,result shows that there is the energy of sound wave leaked into the bottom,the place where leakage occurred can be determined by the ratio of the ocean depth to the wavelength,as compared with normal mode theory.