Abstract: In order to study the backscattering characteristics of the haze by ultraviolet laser (UV laser), the UV laser backscattering model was established to simulate the backscattering process of UV laser under the haze conditions, based on Mie scattering theory and Monte Carlo method. The peak power, peak delay and full width at half maximum of the backscattered echoes of ultraviolet laser pulses with different widths were analyzed. The results show that, within the certain range of haze concentration, the lower haze concentration and the narrower the emission pulse width are, the more obvious the distortion of the laser echo waveform is. As the width of the emission pulse increases, when the emission pulse width is larger than 10 ns, the laser echo is approximately Gaussian distribution; Under the same emission pulse width condition, the peak power and echo peak delay of the laser echo increase with the increase of the haze concentration, and the full width at half maximum of the echo decreases with the increase of the haze concentration, When the emission pulse width is larger than 32 ns, the peak echo power tends to be flat. The results of this paper can provide a theoretical basis for UV laser detection of haze concentration and analyzing the echo characteristics of haze backscattered laser.