Abstract: High order method of moment (MoM) and high frequency ray method are used to simulate the electromagnetic distribution in complex urban environment. High-order MoM method is used to simulate the radiation sources with precision simulation, and the uniform geometrical theory of diffraction method is used to simulate the transmission of electromagnetic waves. Interface schemes of the two methods are presented. In the actual urban environment, the electromagnetic distribution and electromagnetic situation were effectively calculated, and a field survey was carried out in one square kilometer area of a city in Xi'an. The measured data are compared with the simulation ones, and good results are obtained, which proves the effectiveness and practicability of the method.