In this paper, the parabolic equation combined with the piecewise linear shift map method is applied to predict propagation characteristic over triangle terrain with different slope. The results show that the shift map method can produce large error when dealing with the terrain with large slope. Therefore, the paper presents the hybrid of shift map method and terrain mask method. The forecast of propagation over complex terrain is presented by the hybrid method and the viability is verified by the ray-tracing method. The hybrid method which considers the advantages of shift map and terrain mask improves the accuracy greatly and broaden the range of application of terrain modeling.