Abstract: Due to atmospheric turbulence, spreading radio wave will cause phase fluctuations, which is a problem that are often involved in the wireless communications in high-speed rail environments. This will cause the ups and downs of the refractive index of the different atmosphere parts, so that different space parts of radio wave have different phase shifts, which lead to random fluctuation phase shift shapes and other physiognomy, this phase deformation causes ups and downs of the front wave arrival angle. Arrival angle fluctuations will affect the quality of communication. Especially when train travels, arrival angle fluctuations will make the useful signal shifting when transmitted to the train. While the useful signal is lost, it results in a decline in both the communication quality and the utilization of energy. In this paper, in order to study the impact of arrival angle fluctuations on wireless communications, theoretical model has been used to describe the intensity of turbulent conditions at arrival angle fluctuation SNR. At the same time, we simulate the relationship between arrival angle fluctuation SNR and BER, and provide a certain reference value for practical engineering to improve the quality of the wireless communication system.