The dynamic grid model of parabolic equation is presented based on non-uniform mesh technique for the accuracy and timeliness of the radio wave propagation in large scale irregular terrain environment.The feasibility and validity of the dynamic grid model are verified by simulating the radio propagation characteristics in the complex environment including knife-edge.The results show that:In the case of similar calculation accuracy,the parabolic equation with dynamic grid model can reduce the computation time compared with the uniform fine grid and the non-uniform grid in testing; and it has higher accuracy compared with the uniform coarse grid.Therefore,the dynamic grid model can enhance the efficiency greatly in predicting the radio wave propagation.