Abstract: Based on the elliptic mild slope equation and the Message Passing Interface(MPI),a paral ellsolution method is proposed for the simulation of nonlinear wave transformation over a topography with mild slopes,and implemented numericaly on a personal computer(PC)cluster.The nonlinear wave transformation over a typical topography with mild slopes is simulated.A comparison of numerical results with experimental data shows that the application of the nonlinear dispersion relation to the el iptic mild slope equation can ef ectively take the nonlinear effect into account.It can also be seen from the parallel efficiency and speedup rate that the parallel solution method proposed in the present paper can effectively increase the efficiency of numerical simulations.