The scattering characteristics of aerosol backscattering laser echo in aerosol has important influence on the waveform characteristics. In order to obtain the scattering characteristics of aerosol backscattering laser echo, we took fog as the research subject, and simulated the multiple scattering process of backscattering signal in fog by using the model of laser propagation in fog, and calculated the scattering times and propagation time under different fog mass concentrations and fog distances, and analyzed the range of scattering times, the features of same- scattering times echo, and the influence of fog mass concentration and fog distance on the scattering times. The results of this paper can provide an important support for the analysis of the characteristics of aerosol backscattering laser echo.