In order to study the characteristics of UV communication system under the environment of haze, the physical and spectral distribution characteristics of haze particles were studied, the scattering characteristics of haze particles were analyzed in blind ultraviolet by using the theory of scattering. And by using the classical Luettgen single scattering model, the path loss characteristics of non-line-of-sight(NLOS) solar blind UV transmission were studied in the haze environment. By analyzing simulation results of the relationship between path loss and communication distance, visibility and system angle, the theoretical characteristics of haze attenuation in NLOS UV transmission system were obtained: When the communication distance is short, the path loss of the system will be greatly affected by the weather condition (visibility). When the visibility is good, the influence of communication distance on the path loss will be prominent. In practice, it should be as far as possible to select the visibility of more than 2 km weather conditions. The work of this paper provides a theoretical reference for the design of the UV-light communication system and the optimization of the system performance in the haze environment. In addition, it also has certain guiding significance for the system engineering realization.