Abstract: A sound pulse scattering from an edge of thick plates is experimentally and numerically investigated.Beside the edge diffracted signal,plate radiated waves that are excited from the plate edge are also detected in the diffraction process.The phenomena are examined by the elastic plate theory,agreement is observed.The finite difference method (FDM) is used in the numerical calculation.Field distribution at particular time and field at one point as a function of time are displayed.Comparison is made with experiment;It is found that the grid size of FDM formulation may affect accuracy of computation significantly,but computational results show the same phenomena as experimental measured.