College of Geoexploration Science and Technology��Jilin University��Changchun 130026��China

Aiming at the shallow water areas of the South Yellow Sea Basin��using the Q value inversed by pseudo-Q spectral method to build a realistic absorption attenuation model��And then using the ray parameter Taylor expansion method to calculate the variation of cumulative absorption attenuation of formation in different offsets��dif- ferent frequencies and different depths��On this basis��the authors build a theoretical speed model and do single shot seismic record forward modeling using two-dimensional finite difference acoustic wave equation��and through the speed spectrum analysis to understand the development of multiple waves in shallow water situation of the studied area��Theoretical and practical data analysis shows that the shallow attenuation effect take the dominant position in studied area��the energy of multiple waves is strong with serious interference��