Abstract: In this paper, the problem about electromagnetic wave propagation via troposphere over irregular terrains is studied, the staircase terrain modeling method and piecewise linear terrain method of PE method are addressed. A new method about setting initial field and its related algorithms are presented. The results of electromagnetic wave propagation over wedge terrain are calculated using the algorithms above, which we use to make comparison with the results of ray model and UTD model. The comparison shows the accuracy of piecewise linear terrain method.