The non-line of sight single scattering channel model and its solution in ellipsoidal coordinates are introduced.According to vertical transmitter-receiver model, the influence of atmospheric channel on ultraviolet communication system is analyzed. Under different weather conditions and different communication distances, the transmission loss, time-delay and pulse broaden etc. caused by atmospheric channel are quantificationally analyzed and simulated. The simulation results show that: the curve of energy attenuation with visibility dependence has inflection point that the better weather and the higher visibility do not result in greater system receiving energy; when the visibility equals to 18 km, the minimum of energy attenuation occurs; energy attenuation nonlinearly increases with the increase of communication distance, and the energy attenuation is almost 100 dB when the communication distance equals to 1 km; with the increase of the communication distance, both time delay and pulse broaden approximately linearly increase; the time delay is close to 5 μs and pulse broaden is greater than 10 μs when the communication distance equals to 1 km.