The molecules and aerosols in atmosphere have a strong scattering effect on ultraviolet light, so the ultraviolet light can propagate in atmosphere in the condition of non-line-of-sight. In the ultraviolet detection, the transmitter is close to the receiver. In order to study the propagation characteristics of ultraviolet light, a multiple-scattering model is established based on the Monte Carlo method, and the model is optimized by the point probability method. The pulse response and the energy density received by the detector in different atmosphere conditions are analyzed through simulation when the axes of transmitter and receiver are coplanar and non-coplanar. The simulation results show that the ultraviolet laser detection is different from remote target detection, and the deflection angle has a great influence on proximate target detection. When the scattering coefficient and absorption coefficient are large and the distance between the transmitter and the receiver is short, the echo signal is strong. The simulation results are helpful to understand the propagation characteristics of ultraviolet light in the atmosphere, and provide the theoretical foundation for the design of ultraviolet laser detection in the future.